manipulating-lists/slides.org
author Puneeth Chaganti <punchagan@fossee.in>
Tue, 09 Nov 2010 16:14:58 +0530
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#+LaTeX_CLASS: beamer
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#+LaTeX_CLASS_OPTIONS: [presentation]
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#+BEAMER_FRAME_LEVEL: 1
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#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
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#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)
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#+PROPERTY: BEAMER_col_ALL 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 :ETC
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#+LaTeX_CLASS: beamer
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#+LaTeX_CLASS_OPTIONS: [presentation]
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#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl}
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#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
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#+LaTeX_HEADER: \usepackage{listings}
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#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,
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#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
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#+LaTeX_HEADER:  showstringspaces=false, keywordstyle=\color{blue}\bfseries}
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#+TITLE:    Manipulating Lists
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#+AUTHOR:    FOSSEE
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#+EMAIL:     
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#+DATE:    
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#+DESCRIPTION: 
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#+KEYWORDS: 
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#+LANGUAGE:  en
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#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
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#+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc
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#+STARTUP:    align fold nodlcheck hidestars oddeven lognotestate
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* Outline
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  In this session we shall be looking at 
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  - Concatenating lists
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  - Obtaining parts of lists
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  - Sorting lists
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  - Reversing lists
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* Question 1
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  Obtain the primes less than 10, from the list ~primes~. 
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* Solution 1
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  #+begin_src python
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    primes[0:4]
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  #+end_src python
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* Slicing
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  #+begin_src python
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    p[start:stop]
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  #+end_src python
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  - Returns all elements of ~p~ between ~start~ and ~stop~
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  - The element with index equal to ~stop~ is *not* included. 
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* Question 2
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  Obtain all the multiples of three from the list ~num~.
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* Solution 2
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  #+begin_src python
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    num[::3]  
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  #+end_src python
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* Question 3
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  Given a list of marks of students in an examination, obtain a list
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  with marks in descending order.
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  #+begin_src python
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    marks = [99, 67, 47, 100, 50, 75, 62]
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  #+end_src python
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* Solution 3
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  #+begin_src python
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    sorted(marks)[::-1]
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  #+end_src python
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OR
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  #+begin_src python
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    sorted(marks, reverse=True)
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  #+end_src python
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* Summary
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  In this tutorial session we learnt
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    + Obtaining parts of lists using slicing and striding
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    + List concatenation
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    + Sorting lists 
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    + Reversing lists
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* Thank you!
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#+begin_latex
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  \begin{block}{}
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  \begin{center}
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  This spoken tutorial has been produced by the
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  \textcolor{blue}{FOSSEE} team, which is funded by the 
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  \end{center}
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  \begin{center}
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    \textcolor{blue}{National Mission on Education through \\
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      Information \& Communication Technology \\ 
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      MHRD, Govt. of India}.
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  \end{center}  
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  \end{block}
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#+end_latex
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