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diff --git a/day1/Session-4.tex~ b/day1/Session-4.tex~ deleted file mode 100755 index ba2a062..0000000 --- a/day1/Session-4.tex~ +++ /dev/null @@ -1,378 +0,0 @@ -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -% Tutorial slides on Python. -% -% Author: Prabhu Ramachandran <prabhu at aero.iitb.ac.in> -% Copyright (c) 2005-2008, Prabhu Ramachandran -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% - -\documentclass[14pt,compress]{beamer} -%\documentclass[draft]{beamer} -%\documentclass[compress,handout]{beamer} -%\usepackage{pgfpages} -%\pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm] - -% Modified from: generic-ornate-15min-45min.de.tex -\mode<presentation> -{ - \usetheme{Warsaw} - \useoutertheme{split} - \setbeamercovered{transparent} -} - -\usepackage[english]{babel} -\usepackage[latin1]{inputenc} -%\usepackage{times} -\usepackage[T1]{fontenc} - -% Taken from Fernando's slides. -\usepackage{ae,aecompl} -\usepackage{mathpazo,courier,euler} -\usepackage[scaled=.95]{helvet} - -\definecolor{darkgreen}{rgb}{0,0.5,0} - -\usepackage{listings} -\lstset{language=Python, - basicstyle=\ttfamily\bfseries, - commentstyle=\color{red}\itshape, - stringstyle=\color{darkgreen}, - showstringspaces=false, - keywordstyle=\color{blue}\bfseries} - -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -% Macros -\setbeamercolor{emphbar}{bg=blue!20, fg=black} -\newcommand{\emphbar}[1] -{\begin{beamercolorbox}[rounded=true]{emphbar} - {#1} - \end{beamercolorbox} -} -\newcounter{time} -\setcounter{time}{0} -\newcommand{\inctime}[1]{\addtocounter{time}{#1}{\tiny \thetime\ m}} - -\newcommand{\typ}[1]{\texttt{#1}} - -\newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}} } - -%%% This is from Fernando's setup. -% \usepackage{color} -% \definecolor{orange}{cmyk}{0,0.4,0.8,0.2} -% % Use and configure listings package for nicely formatted code -% \usepackage{listings} -% \lstset{ -% language=Python, -% basicstyle=\small\ttfamily, -% commentstyle=\ttfamily\color{blue}, -% stringstyle=\ttfamily\color{orange}, -% showstringspaces=false, -% breaklines=true, -% postbreak = \space\dots -% } - - -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -% Title page -\title[Basic Python]{Python:\\Advanced Python data structures, Functions and Debugging} - -\author[FOSSEE Team] {Asokan Pichai\\Prabhu Ramachandran} - -\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay} -\date[] {10, October 2009} -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% - -%\pgfdeclareimage[height=0.75cm]{iitmlogo}{iitmlogo} -%\logo{\pgfuseimage{iitmlogo}} - - -%% Delete this, if you do not want the table of contents to pop up at -%% the beginning of each subsection: -\AtBeginSubsection[] -{ - \begin{frame}<beamer> - \frametitle{Outline} - \tableofcontents[currentsection,currentsubsection] - \end{frame} -} - - -% If you wish to uncover everything in a step-wise fashion, uncomment -% the following command: -%\beamerdefaultoverlayspecification{<+->} - -%\includeonlyframes{current,current1,current2,current3,current4,current5,current6} - -%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -% DOCUMENT STARTS -\begin{document} - -\begin{frame} - \titlepage -\end{frame} - -\section{Python} - -\subsection{Dictionary} -\begin{frame}{Dictionary} - \begin{itemize} - \item aka associative arrays, key-value pairs, hashmaps, hashtables \ldots - \item \typ{ d = \{ ``Hitchhiker's guide'' : 42, ``Terminator'' : ``I'll be back''\}} - \item lists and tuples index: 0 \ldots n - \item dictionaries index using strings - \item aka key-value pairs - \item what can be keys? - \end{itemize} -\end{frame} - -\begin{frame}{Dictionary \ldots } - \begin{itemize} - \item \alert{Unordered} - \begin{block}{Standard usage} - for key in dict:\\ - <use> dict[key] \# => value - \end{block} - \item \typ{d.keys()} returns a list - \item can we have duplicate keys? - \end{itemize} - \inctime{5} -\end{frame} - -\begin{frame} {Problem Set 2.1} - \begin{description} -\item[2.1.1] You are given date strings of the form ``29, Jul 2009'', or ``4 January 2008''. In other words a number a string and another number, with a comma sometimes separating the items.Write a function that takes such a string and returns a tuple (yyyy, mm, dd) where all three elements are ints. - \item[2.1.2] Count word frequencies in a file. - \item[2.1.3] Find the most used Python keywords in your Python code (import keyword). -\end{description} - -\inctime{10} -\end{frame} - -\subsection{Set} -\begin{frame}[fragile] - \frametitle{Set} - \begin{itemize} - \item Simplest container, mutable - \item No ordering, no duplicates - \item usual suspects: union, intersection, subset \ldots - \item >, >=, <, <=, in, \ldots - \end{itemize} - \begin{lstlisting} ->>> f10 = set([1,2,3,5,8]) ->>> p10 = set([2,3,5,7]) ->>> f10|p10 -set([1, 2, 3, 5, 7, 8]) ->>> f10&p10 -set([2, 3, 5]) ->>> f10-p10 -set([8, 1]) -\end{lstlisting} -\end{frame} - -\begin{frame}[fragile] - \frametitle{Set} - \begin{lstlisting} ->>> p10-f10, f10^p10 -set([7]), set([1, 7, 8]) ->>> set([2,3]) < p10 -True ->>> set([2,3]) <= p10 -True ->>> 2 in p10 -True ->>> 4 in p10 -False ->>> len(f10) -5 -\end{lstlisting} -\inctime{5} -\end{frame} - - -\begin{frame} - \frametitle{Problem set 2.2} - \begin{description} - \item[2.2.1] Given a dictionary of the names of students and their marks, identify how many duplicate marks are there? and what are these? - \item[2.2.2] Given a string of the form ``4-7, 9, 12, 15'' find the numbers missing in this list for a given range. -\end{description} -\inctime{10} -\end{frame} - -\subsection{Functions Reloaded!} -\begin{frame}[fragile] - \frametitle{Advanced functions} - \begin{itemize} - \item default args - \item var args - \item keyword args - \item scope - \item \typ{global} - \end{itemize} -\end{frame} - -\begin{frame}[fragile] - \frametitle{Functions: default arguments} - \small - \begin{lstlisting} -def ask_ok(prompt, retries=4, - complaint='Yes or no!'): - while True: - ok = raw_input(prompt) - if ok in ('y', 'ye', 'yes'): - return True - if ok in ('n', 'no', 'nop', - 'nope'): - return False - retries = retries - 1 - if retries < 0: - raise IOError, 'bad user' - print complaint - \end{lstlisting} -\end{frame} - -\begin{frame}[fragile] - \frametitle{Functions: keyword arguments} - \small - \begin{lstlisting} -def parrot(voltage, state='a stiff', - action='voom', type='Royal Blue'): - print "-- This parrot wouldn't", action, - print "if you supply", voltage, "Volts." - print "-- Lovely plumage, the", type - print "-- It's", state, "!" - -parrot(1000) -parrot(action = 'VOOOOOM', voltage = 1000000) -parrot('a thousand', - state = 'pushing up the daisies') -parrot('a million', 'bereft of life', 'jump') -\end{lstlisting} -\end{frame} - -\begin{frame}[fragile] - \frametitle{Functions: arbitrary argument lists} - \begin{itemize} - \item Arbitrary number of arguments using \verb+*args+ or - \verb+*whatever+ - \item Keyword arguments using \verb+**kw+ - \item Given a tuple/dict how do you call a function? - \begin{itemize} - \item Using argument unpacking - \item For positional arguments: \verb+foo(*[5, 10])+ - \item For keyword args: \verb+foo(**{'a':5, 'b':10})+ - \end{itemize} - \end{itemize} -\end{frame} - - \begin{frame}[fragile] -\begin{lstlisting} -def foo(a=10, b=100): - print a, b -def func(*args, **keyword): - print args, keyword -# Unpacking: -args = [5, 10] -foo(*args) -kw = {'a':5, 'b':10} -foo(**kw) -\end{lstlisting} - \inctime{15} -\end{frame} - -\subsection{Functional programming} -\begin{frame}[fragile] - \frametitle{Functional programming} -What is the basic idea?\\ -Why is it interesting?\\ -\typ{map, reduce, filter}\\ -list comprehension\\ -generators - \inctime{15} -\end{frame} - -\subsection{Debugging} -\begin{frame}[fragile] - \frametitle{Errors} - \begin{lstlisting} ->>> while True print 'Hello world' - File "<stdin>", line 1, in ? - while True print 'Hello world' - ^ -SyntaxError: invalid syntax -\end{lstlisting} -\end{frame} - -\begin{frame}[fragile] - \frametitle{Exceptions} - \begin{lstlisting} ->>> print spam -Traceback (most recent call last): - File "<stdin>", line 1, in <module> -NameError: name 'spam' is not defined - ->>> 1 / 0 -Traceback (most recent call last): - File "<stdin>", line 1, in <module> -ZeroDivisionError: integer division -or modulo by zero -\end{lstlisting} -\end{frame} - -\begin{frame}[fragile] - \frametitle{Debugging effectively} - - \begin{itemize} - \item \kwrd{print} based strategy - \item Process: Hypothesis, test, refine, rinse-repeat - \item Using \typ{\%debug} and \typ{\%pdb} in IPython - \end{itemize} - \inctime{15} -\end{frame} - -\begin{frame}[fragile] -\frametitle{Debugging: example} -\small -\begin{lstlisting} ->>> import pdb ->>> import mymodule ->>> pdb.run('mymodule.test()') -> <string>(1)<module>() -(Pdb) continue -Traceback (most recent call last): - File "<stdin>", line 1, in <module> - File "/usr/lib/python2.6/pdb.py", line 1207, in run - Pdb().run(statement, globals, locals) - File "/usr/lib/python2.6/bdb.py", line 368, in run - exec cmd in globals, locals - File "<string>", line 1, in <module> - File "mymodule.py", line 2, in test - print spam -NameError: global name 'spam' is not defined -\end{lstlisting} -\end{frame} - -\begin{frame}[fragile] -\frametitle{Debugging in IPython} -\small -\begin{lstlisting} -In [1]: %pdb -Automatic pdb calling has been turned ON -In [2]: import mymodule -In [3]: mymodule.test() ----------------------------------------------- -NameError Traceback (most recent call last) -/media/python/iitb/workshops/day1/<ipython console> in <module>() -/media/python/iitb/workshops/day1/mymodule.pyc in test() - 1 def test(): -----> 2 print spam -NameError: global name 'spam' is not defined -> /media/python/iitb/workshops/day1/mymodule.py(2)test() - 0 print spam -ipdb> -\end{lstlisting} -\end{frame} - -\begin{frame}[fragile] -\frametitle{Debugging: Exercise} -\end{frame} - -\end{document} |