author | Madhusudan.C.S <madhusudancs@gmail.com> |
Fri, 06 Nov 2009 18:36:42 +0530 | |
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permissions | -rw-r--r-- |
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%Tutorial slides on Python. |
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% Author: FOSSEE |
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% Copyright (c) 2009, FOSSEE, IIT Bombay |
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\documentclass[14pt,compress]{beamer} |
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%\documentclass[draft]{beamer} |
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%\documentclass[compress,handout]{beamer} |
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%\usepackage{pgfpages} |
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%\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm] |
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% Modified from: generic-ornate-15min-45min.de.tex |
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\mode<presentation> |
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{ |
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\usetheme{Warsaw} |
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\useoutertheme{infolines} |
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\setbeamercovered{transparent} |
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} |
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\usepackage[english]{babel} |
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\usepackage[latin1]{inputenc} |
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%\usepackage{times} |
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\usepackage[T1]{fontenc} |
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% Taken from Fernando's slides. |
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\usepackage{ae,aecompl} |
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\usepackage{mathpazo,courier,euler} |
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\usepackage[scaled=.95]{helvet} |
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\definecolor{darkgreen}{rgb}{0,0.5,0} |
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\usepackage{listings} |
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\lstset{language=Python, |
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basicstyle=\ttfamily\bfseries, |
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commentstyle=\color{red}\itshape, |
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stringstyle=\color{darkgreen}, |
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showstringspaces=false, |
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keywordstyle=\color{blue}\bfseries} |
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% Macros |
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\setbeamercolor{emphbar}{bg=blue!20, fg=black} |
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\newcommand{\emphbar}[1] |
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{\begin{beamercolorbox}[rounded=true]{emphbar} |
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{#1} |
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\end{beamercolorbox} |
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} |
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\newcounter{time} |
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\setcounter{time}{0} |
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\newcommand{\inctime}[1]{\addtocounter{time}{#1}{\tiny \thetime\ m}} |
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\newcommand{\typ}[1]{\texttt{#1}} |
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\newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}} } |
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%%% This is from Fernando's setup. |
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% \usepackage{color} |
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% \definecolor{orange}{cmyk}{0,0.4,0.8,0.2} |
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% % Use and configure listings package for nicely formatted code |
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% \lstset{ |
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% language=Python, |
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% basicstyle=\small\ttfamily, |
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% commentstyle=\ttfamily\color{blue}, |
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% stringstyle=\ttfamily\color{orange}, |
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% showstringspaces=false, |
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% breaklines=true, |
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% postbreak = \space\dots |
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% } |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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% Title page |
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\title[Basic Python]{Python language: Data structures and functions} |
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\author[FOSSEE Team] {The FOSSEE Group} |
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\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay} |
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\date[] {8 November, 2009\\Day 2, Session 3} |
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% |
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%\pgfdeclareimage[height=0.75cm]{iitmlogo}{iitmlogo} |
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%\logo{\pgfuseimage{iitmlogo}} |
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%% Delete this, if you do not want the table of contents to pop up at |
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%% the beginning of each subsection: |
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\AtBeginSubsection[] |
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{ |
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\begin{frame}<beamer> |
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\frametitle{Outline} |
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\tableofcontents[currentsection,currentsubsection] |
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\end{frame} |
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} |
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\AtBeginSection[] |
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\begin{frame}<beamer> |
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\frametitle{Outline} |
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\tableofcontents[currentsection,currentsubsection] |
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\end{frame} |
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} |
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% If you wish to uncover everything in a step-wise fashion, uncomment |
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% the following command: |
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%\beamerdefaultoverlayspecification{<+->} |
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%\includeonlyframes{current,current1,current2,current3,current4,current5,current6} |
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% DOCUMENT STARTS |
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\begin{document} |
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\titlepage |
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\end{frame} |
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\begin{frame} |
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\frametitle{Outline} |
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\tableofcontents |
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% You might wish to add the option [pausesections] |
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\end{frame} |
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\section{Functions} |
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\subsection{Default arguments} |
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\begin{frame}[fragile] |
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\frametitle{Functions: default arguments} |
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\begin{lstlisting} |
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In []: greet = 'hello world' |
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In []: greet.split() |
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Out[]: ['hello', 'world'] |
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In []: line = 'Rossum, Guido, 54, 46, 55' |
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In []: line.split(',') |
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Out[]: ['Rossum', ' Guido', ' 54', |
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' 46', ' 55'] |
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\end{lstlisting} |
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\end{frame} |
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\begin{frame}[fragile] |
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\frametitle{Functions: default arguments \ldots} |
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\small |
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def ask_ok(prompt, complaint='Yes or no!'): |
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while True: |
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ok = raw_input(prompt) |
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return True |
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'nope'): |
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return False |
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print complaint |
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ask_ok('?') |
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ask_ok('?', '[Y/N]') |
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\end{lstlisting} |
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\end{frame} |
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\subsection{Keyword arguments} |
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\begin{frame}[fragile] |
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\frametitle{Functions: Keyword arguments} |
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We have seen the following |
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\begin{lstlisting} |
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In []: legend(['sin(2y)'], |
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loc='center') |
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In []: plot(y, sin(y), 'g', |
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linewidth=2) |
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In []: annotate('local max', |
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xy=(1.5, 1)) |
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In []: pie(science.values(), |
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labels=science.keys()) |
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\end{lstlisting} |
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\end{frame} |
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\begin{frame}[fragile] |
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\frametitle{Functions: keyword arguments \ldots} |
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\small |
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\begin{lstlisting} |
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def ask_ok(prompt, complaint='Yes or no!'): |
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while True: |
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ok = raw_input(prompt) |
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if ok in ('y', 'ye', 'yes'): |
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return True |
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if ok in ('n', 'no', 'nop', |
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'nope'): |
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return False |
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print complaint |
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ask_ok(prompt='?') |
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ask_ok(prompt='?', complaint='[y/n]') |
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ask_ok(complaint='[y/n]', prompt='?') |
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\end{lstlisting} |
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\end{frame} |
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\subsection{Built-in functions} |
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\begin{frame} |
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{Before writing a function} |
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\begin{itemize} |
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\item Variety of builtin functions are available |
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\item \typ{abs, any, all, len, max, min} |
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\item \typ{pow, range, sum, type} |
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\item Refer here: |
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\url{http://docs.python.org/library/functions.html} |
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\end{itemize} |
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\inctime{10} |
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\end{frame} |
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\subsection{Exercises} |
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\begin{frame}{Problem set 3: Problem 3.1} |
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Write a function to return the gcd of two numbers. |
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\end{frame} |
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\begin{frame}{Problem 3.2} |
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Write a program to print all primitive pythagorean triads (a, b, c) where a, b are in the range 1---100 \\ |
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A pythagorean triad $(a,b,c)$ has the property $a^2 + b^2 = c^2$.\\By primitive we mean triads that do not `depend' on others. For example, (4,3,5) is a variant of (3,4,5) and hence is not primitive. And (10,24,26) is easily derived from (5,12,13) and is also not primitive. |
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\end{frame} |
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\begin{frame}{Problem 3.3} |
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Write a program that generates a list of all four digit numbers that have all their digits even and are perfect squares.\newline\\\emph{For example, the output should include 6400 but not 8100 (one digit is odd) or 4248 (not a perfect square).} |
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\inctime{15} |
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\end{frame} |
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\section{Modules} |
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\begin{frame}[fragile] |
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\frametitle{\typ{from} \ldots \typ{import} magic} |
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\begin{lstlisting} |
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from scipy.interpolate import splrep |
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from scipy.interpolate import splev |
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from scipy.integrate import quad |
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from scipy.integrate import odeint |
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\end{lstlisting} |
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\emphbar{All the above statements import one function into your namespace} |
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\end{frame} |
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\frametitle{Running scripts from command line} |
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\small |
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\item Start cmd |
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\item python sine\_plot.py |
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\pause |
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Traceback (most recent call last): |
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File "sine_plot.py", line 1, in <module> |
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x = linspace(-5*pi, 5*pi, 500) |
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NameError: name 'linspace' is not defined |
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\end{lstlisting} |
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\end{frame} |
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\frametitle{Remedy} |
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\emphbar{Adding what lines to sine\_plot.py makes this program work?} |
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from scipy import * |
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\alert{Now run python sine\_plot.py again!} |
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\pause |
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Traceback (most recent call last): |
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File "sine_plot.py", line 4, in <module> |
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plot(x, x, 'b') |
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NameError: name 'plot' is not defined |
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\end{lstlisting} |
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\end{frame} |
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\frametitle{Remedy \ldots} |
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\emphbar{What should we add now?} |
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from pylab import * |
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\alert{Now run python sine\_plot.py again!!} |
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\end{frame} |
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\frametitle{Modules} |
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In []: from scipy import * |
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\item What is the difference? |
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\item \alert{Use the former only in interactive mode} |
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\end{itemize} |
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\end{frame} |
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\frametitle{Package hierarchies} |
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from scipy.interpolate import splev |
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from scipy.integrate import quad |
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\end{frame} |
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\frametitle{from \ldots import in a conventional way!} |
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\small |
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from scipy import linspace, pi, sin |
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from pylab import plot, legend, annotate |
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from pylab import xlim, ylim |
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plot(x, x, 'b') |
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plot(x, -x, 'b') |
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legend(['x', '-x', 'sin(x)', 'xsin(x)']) |
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annotate('origin', xy = (0, 0)) |
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ylim(-5*pi, 5*pi) |
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\end{lstlisting} |
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\end{frame} |
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\frametitle{from \ldots import in a conventional way!} |
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import scipy |
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import pylab |
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pylab.ylim(-5*scipy.pi, 5*scipy.pi) |
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\end{lstlisting} |
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\end{frame} |
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\frametitle{Modules: Standard library} |
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\item Very powerful, ``Batteries included'' |
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\item Some standard modules: |
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\item Math: \typ{math}, \typ{random} |
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\item Compression: \typ{gzip}, \typ{zipfile}, and \typ{tarfile} |
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\item And a whole lot more! |
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\inctime{5} |
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\begin{frame}[fragile] |
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\frametitle{Modules of special interest} |
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\begin{description}[matplotlibfor2d] |
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\item[\typ{pylab}] Easy, interactive, 2D plotting |
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algebra, Fourier transforms, signal and image processing, |
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genetic algorithms, ODE solvers, special functions, and more |
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\item[\typ{Mayavi}] Easy, interactive, 3D plotting |
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\end{description} |
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\end {frame} |
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In []: "Hello World".split() |
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Out[]: ['Hello', 'World'] |
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\end{lstlisting} |
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\small |
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for element in (1, 2, 3): |
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print element |
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print key |
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print char |
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for line in open("myfile.txt"): |
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print line |
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for line in urllib2.urlopen('http://site.com'): |
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\inctime{10} |
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\end{document} |