author | Shantanu <shantanu@fossee.in> |
Tue, 22 Dec 2009 14:10:37 +0530 | |
changeset 330 | 46533051b9d3 |
parent 329 | 0a6ab1d81491 |
permissions | -rw-r--r-- |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
1 |
\documentclass[12pt]{article} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
2 |
|
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
3 |
|
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
4 |
\title{Python: Data Structures} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
5 |
\author{FOSSEE} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
6 |
\usepackage{listings} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
7 |
\lstset{language=Python, |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
8 |
basicstyle=\ttfamily, |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
9 |
commentstyle=\itshape\bfseries, |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
10 |
showstringspaces=false |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
11 |
} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
12 |
\newcommand{\typ}[1]{\lstinline{#1}} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
13 |
\usepackage[english]{babel} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
14 |
\usepackage[latin1]{inputenc} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
15 |
\usepackage{times} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
16 |
\usepackage[T1]{fontenc} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
17 |
\usepackage{ae,aecompl} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
18 |
\usepackage{mathpazo,courier,euler} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
19 |
\usepackage[scaled=.95]{helvet} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
20 |
|
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
21 |
\begin{document} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
22 |
\date{} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
23 |
\vspace{-1in} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
24 |
\begin{center} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
25 |
\LARGE{Python: Data Structures}\\ |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
26 |
\large{FOSSEE} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
27 |
\end{center} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
28 |
\section{Basic Looping} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
29 |
\subsection{\typ{while}} |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
30 |
\begin{lstlisting} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
31 |
In []: a, b = 0, 1 |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
32 |
In []: while b < 10: |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
33 |
...: print b, |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
34 |
...: a, b = b, a + b # Fibonacci Sequence |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
35 |
...: |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
36 |
\end{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
37 |
Basic syntax of \typ{while} loop is: |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
38 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
39 |
while condition: |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
40 |
statement1 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
41 |
statement2 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
42 |
\end{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
43 |
All statements are executed, till the condition statement evaluates to True. |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
44 |
\subsection{\typ{for} and \typ{range}} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
45 |
\typ{range(start, stop, step)}\\ |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
46 |
returns a list containing an arithmetic progression of integers.\\ |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
47 |
Of the arguments mentioned above, both start and step are optional.\\ |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
48 |
For example, if we skip third argument, i.e \typ{step}, default is taken as 1. So: |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
49 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
50 |
In []: range(1,10) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
51 |
Out[]: [1, 2, 3, 4, 5, 6, 7, 8, 9] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
52 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
53 |
\textbf{Note:} stop value is not included in the list.\\ |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
54 |
Similarly if we don't pass \typ{first} argument (in this case \typ{start}), default is taken to be 0. |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
55 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
56 |
In []: range(10) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
57 |
Out[]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
58 |
\end{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
59 |
In case third argument is mentioned(\typ{step}), the jump between consecutive members of the list would be equal to that. |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
60 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
61 |
In []: range(1,10,2) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
62 |
Out[]: [1, 3, 5, 7, 9] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
63 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
64 |
%Notice the jump between two consecutive elements is 2, i.e step.\\ |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
65 |
\typ{for} and \typ{range}\\ |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
66 |
As mentioned previously \typ{for} in Python is used to iterate through the list members. So \typ{for} and \typ{range} can be used together to iterate through required series. For example to get square of all numbers less then 5 and greater then equal to 0, code can be written as: |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
67 |
\begin{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
68 |
In []: for i in range(5): |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
69 |
....: print i, i * i |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
70 |
....: |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
71 |
....: |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
72 |
0 0 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
73 |
1 1 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
74 |
2 4 |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
75 |
3 9 |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
76 |
4 16 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
77 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
78 |
|
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
79 |
\section{list} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
80 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
81 |
In []: num = [1, 2, 3, 4] # Initializing a list |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
82 |
In []: num |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
83 |
Out[]: [1, 2, 3, 4] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
84 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
85 |
\subsection{Accessing individual elements} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
86 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
87 |
In []: num[1] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
88 |
Out[]: 2 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
89 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
90 |
\textbf{Note:} Index of list starts from 0. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
91 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
92 |
In []: num[5] # ERROR: throws a index error |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
93 |
IndexError: list index out of range |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
94 |
In []: num[-1] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
95 |
Out[]: 4 |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
96 |
\end{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
97 |
\textbf{Note: }\typ{-1} points to last element in a list. Similarly to access third last element of a list one can use: |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
98 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
99 |
In []: num[-3] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
100 |
Out[]: 2 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
101 |
\end{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
102 |
\subsection{\typ{list} operations} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
103 |
\begin{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
104 |
In []: num += [9, 10, 11] # Concatenating two lists |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
105 |
In []: num |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
106 |
Out[]: [1, 2, 3, 4, 9, 10, 11] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
107 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
108 |
\typ{list} provides \typ{append} function to append objects at the end. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
109 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
110 |
In []: num = [1, 2, 3, 4] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
111 |
In []: num.append(-2) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
112 |
In []: num |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
113 |
Out[]: [1, 2, 3, 4, -2] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
114 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
115 |
%% In []: num += [-5] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
116 |
%% In []: num |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
117 |
%% Out[]: [1, 2, 3, 4, -2, -5] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
118 |
Working of \typ{append} is different from \typ{+} operator on list. Till here both will behave as same. But in following case: |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
119 |
\begin{lstlisting} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
120 |
In []: num = [1, 2, 3, 4] |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
121 |
|
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
122 |
In []: num + [9, 10, 11] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
123 |
Out[]: [1, 2, 3, 4, 9, 10, 11] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
124 |
|
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
125 |
In []: num.append([9, 10, 11]) # appending a list to a list |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
126 |
|
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
127 |
In []: num |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
128 |
Out[]: [1, 2, 3, 4, [9, 10, 11]] # last element is a list |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
129 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
130 |
when one attempts to append a list(in above case [9, 10, 11]) to a list(num) it adds list as a single element. So the resulting list will have a element which itself is a list. But \typ{+} operator would simply add the elements of second list.\\ |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
131 |
\subsection{Miscellaneous} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
132 |
\begin{lstlisting} |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
133 |
In []: num = [1, 2, 3, 4] |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
134 |
In []: num.extend([5, 6, 7]) # extend list by adding elements |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
135 |
In []: num |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
136 |
Out[]: [1, 2, 3, 4, 5, 6, 7] |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
137 |
In []: num.reverse() # reverse the current list |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
138 |
In []: num |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
139 |
Out[]: [7, 6, 5, 4, 3, 2, 1] |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
140 |
In []: num.remove(6) # removing first occurrence of 6 |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
141 |
In []: num |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
142 |
Out[]: [7, 5, 4, 3, 2, 1] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
143 |
In []: len(num) # returns the length of list |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
144 |
Out[]: 6 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
145 |
In []: a = [1, 5, 3, 7, -2, 4] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
146 |
In []: min(a) # returns smallest item in a list. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
147 |
Out[]: -2 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
148 |
In []: max(a) # returns largest item in a list. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
149 |
Out[]: 7 |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
150 |
\end{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
151 |
|
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
152 |
\subsection{Slicing} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
153 |
General syntax for getting slice out of a list is \\ |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
154 |
\typ{list[initial:final:step]} |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
155 |
\begin{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
156 |
In []: a = [1, 2, 3, 4, 5] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
157 |
In []: a[1:-1:2] |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
158 |
Out[]: [2, 4] |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
159 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
160 |
Start slice from second element(1), till the last element(-1) with step size of 2. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
161 |
\begin{lstlisting} |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
162 |
In []: a[::2] |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
163 |
Out[]: [1, 3, 5] |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
164 |
\end{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
165 |
Start from beginning(since \typ{initial} is blank), till last(this time last element is included, as \typ{final} is blank), with step size of 2.\\ |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
166 |
Apart from using \typ{reverse} command on list, one can also use slicing in special way to get reverse of a list. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
167 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
168 |
In []: a[-1:-4:-1] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
169 |
Out[]: [5, 4, 3] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
170 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
171 |
Above syntax of slice can be expressed as, ``start from last element(\typ{-1}), go till fourth last element(\typ{-4}), with step size \typ{-1}, which implies, go in reverse direction. That is, first element would be \typ{a[-1]}, second element would be \typ{a[-2]} and so on and so forth.''\\ |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
172 |
So to get reverse of whole list one can write following slice syntax: |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
173 |
\begin{lstlisting} |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
174 |
In []: a[-1::-1] |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
175 |
Out[]: [5, 4, 3, 2, 1] |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
176 |
\end{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
177 |
Since \typ{final} is left blank, it will traverse through whole list in reverse manner.\\ |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
178 |
\textbf{Note:} While \typ{reverse} reverses the original list, slicing will just result in a instance list with reverse of original, which can be used and worked upon independently. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
179 |
%%Should we include list copy concept here? |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
180 |
\subsection{Containership} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
181 |
\typ{in} keyword is used to check for containership of any element in a given list. |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
182 |
\begin{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
183 |
In []: a = [2, 5, 4, 6, 9] |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
184 |
In []: 4 in a |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
185 |
Out[]: True |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
186 |
|
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
187 |
In []: b = 15 |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
188 |
In []: b in a |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
189 |
Out[]: False |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
190 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
191 |
\section{Tuples} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
192 |
Tuples are sequences just like Lists, but they are \textbf{immutable}, or items/elements cannot be changed in any way. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
193 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
194 |
In []: t = (1, 2, 3, 4, 5, 6, 7, 8) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
195 |
\end{lstlisting} |
330
46533051b9d3
commited changes made for scipy and cheatsheats.
Shantanu <shantanu@fossee.in>
parents:
329
diff
changeset
|
196 |
\textbf{Note:} For tuples we use parentheses in place of square brackets, rest is same as lists. |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
197 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
198 |
In []: t[0] + t[3] + t[-1] # elements are accessed via indices |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
199 |
Out[]: 13 |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
200 |
In []: t[4] = 7 # ERROR: tuples are immutable |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
201 |
\end{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
202 |
\textbf{Note:} elements cant be changed! |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
203 |
\section{Dictionaries} |
327
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
204 |
Dictionaries are data structures that provide key-value mappings. They are similar to lists except that instead of the values having integer indexes, they have keys or strings as indexes.\\ |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
205 |
A simple dictionary can be created by: |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
206 |
\begin{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
207 |
In []: player = {'Mat': 134,'Inn': 233, |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
208 |
'Runs': 10823, 'Avg': 52.53} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
209 |
\end{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
210 |
For above case, value on left of ':' is key and value on right is corresponding value. To retrieve value related to key 'Avg' |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
211 |
\begin{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
212 |
In []: player['Avg'] |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
213 |
Out[]: 52.530000000000001 |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
214 |
\end{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
215 |
\subsection{Element operations} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
216 |
\begin{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
217 |
In []: player['Name'] = 'Rahul Dravid' #Adds new key-value pair. |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
218 |
In []: player |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
219 |
Out[]: |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
220 |
{'Avg': 52.530000000000001, |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
221 |
'Inn': 233, |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
222 |
'Mat': 134, |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
223 |
'Name': 'Rahul Dravid', |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
224 |
'Runs': 10823} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
225 |
In []: player.pop('Mat') # removing particular key-value pair |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
226 |
Out[]: 134 |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
227 |
In [21]: player |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
228 |
Out[21]: {'Avg': 52.530000000000001, 'Inn': 233, |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
229 |
'Name': 'Rahul Dravid', 'Runs': 10823} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
230 |
\end{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
231 |
\begin{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
232 |
In []: player['Name'] = 'Dravid' |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
233 |
In []: player |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
234 |
Out[23]: {'Avg': 52.530000000000001, 'Inn': 233, |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
235 |
'Name': 'Dravid', 'Runs': 10823} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
236 |
\end{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
237 |
\textbf{Note:} Duplicate keys are overwritten! |
327
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
238 |
\subsection{containership} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
239 |
\begin{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
240 |
In []: 'Inn' in player |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
241 |
Out[]: True |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
242 |
In []: 'Econ' in player |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
243 |
Out[]: False |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
244 |
\end{lstlisting} |
329
0a6ab1d81491
Some more changes for day 2 sessions.
shantanu <shantanu@fossee.in>
parents:
327
diff
changeset
|
245 |
\textbf{Note:} Containership is always checked on 'keys' of dictionary, never on 'values'.\\ |
327
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
246 |
\subsection{Methods} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
247 |
\begin{lstlisting} |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
248 |
In []: player.keys() # returns list of all keys |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
249 |
Out[]: ['Runs', 'Inn', 'Avg', 'Mat'] |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
250 |
|
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
251 |
In []: player.values() # returns list of all values. |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
252 |
Out[]: [10823, 233, |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
253 |
52.530000000000001, 134] |
c78cad28c2f7
modifeid cheat sheets for session 3, 4 day 2.
Shantanu <shantanu@fossee.in>
parents:
326
diff
changeset
|
254 |
\end{lstlisting} |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
255 |
\section{Sets} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
256 |
are an unordered collection of unique elements.\\ |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
257 |
Creation: |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
258 |
\begin{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
259 |
In []: s = set([2,4,7,8,5]) # creating a basic set |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
260 |
In []: s |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
261 |
Out[]: set([2, 4, 5, 7, 8]) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
262 |
In []: g = set([2, 4, 5, 7, 4, 0, 5]) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
263 |
In []: g |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
264 |
Out[]: set([0, 2, 4, 5, 7]) # No repetition allowed. |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
265 |
\end{lstlisting} |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
266 |
Some other operations which can be performed on sets are: |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
267 |
\begin{lstlisting} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
268 |
In []: f = set([1,2,3,5,8]) |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
269 |
In []: p = set([2,3,5,7]) |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
270 |
In []: f | p # Union of two sets |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
271 |
Out[]: set([1, 2, 3, 5, 7, 8]) |
326
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
272 |
In []: f & p # Intersection of two sets |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
273 |
Out[]: set([2, 3, 5]) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
274 |
In []: f - p # Elements in f not is p |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
275 |
Out[]: set([1, 8]) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
276 |
In []: f ^ p # (f - p) | (p - f) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
277 |
Out[]: set([1, 7, 8])) |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
278 |
In []: set([2,3]) < p # Test for subset |
f57f42861770
Cheat sheet for session 2 day 2.
Shantanu <shantanu@fossee.in>
parents:
301
diff
changeset
|
279 |
Out[]: True |
301
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
280 |
\end{lstlisting} |
49bdffe4dca5
Updated session 2 slides of day 1 and added cheatsheets of day 2.
Santosh G. Vattam <vattam.santosh@gmail.com>
parents:
diff
changeset
|
281 |
\end{document} |