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| -rw-r--r-- | day1/DebugginDiagram.png | bin | 9416 -> 8560 bytes | |||
| -rwxr-xr-x | day1/Session-2.tex | 50 | ||||
| -rwxr-xr-x | day1/Session-4.tex | 65 | ||||
| -rw-r--r-- | day1/debug_exercise.py | 16 | ||||
| -rw-r--r-- | day1/exercise/kwfreq.py | 4 | ||||
| -rw-r--r-- | quiz.tex | 149 |
6 files changed, 238 insertions, 46 deletions
diff --git a/day1/DebugginDiagram.png b/day1/DebugginDiagram.png Binary files differindex 530d1a0..41af377 100644 --- a/day1/DebugginDiagram.png +++ b/day1/DebugginDiagram.png diff --git a/day1/Session-2.tex b/day1/Session-2.tex index 5c597d4..430f5b7 100755 --- a/day1/Session-2.tex +++ b/day1/Session-2.tex @@ -110,9 +110,9 @@ \titlepage \end{frame} -\section{Functions and basic data structures} +\section{Control Flow} -\subsection{Exercises on Control flow} +\subsection{Exercises} \begin{frame} \frametitle{Problem set 1} \begin{itemize} @@ -123,7 +123,10 @@ \begin{frame}{Problem 1.1} Write a program that displays all three digit numbers that are equal to the sum of the cubes of their digits. That is, print numbers $abc$ that have the property $abc = a^3 + b^3 + c^3$\\ +\begin{block} +{Information...} These are called $Armstrong$ numbers. +\end{block} \end{frame} \begin{frame}{Problem 1.2 - Collatz sequence} @@ -155,7 +158,8 @@ When can your code fail? % TIME: 20 m, running 20m %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -\subsection{Functions} +\section{Functions} +\subsection{Defining} \begin{frame}[fragile] \frametitle{Functions: examples} \begin{lstlisting} @@ -229,10 +233,11 @@ def what( n, x ): \end{lstlisting} \end{frame} +\subsection{Built-in functions} \begin{frame} {Before writing a function} \begin{itemize} - \item Builtin functions for various and sundry + \item Variety of builtin functions are available \item \typ{abs, any, all, len, max, min} \item \typ{pow, range, sum, type} \item Refer here: @@ -244,32 +249,29 @@ def what( n, x ): % TIME: 10 m, running 30m %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -\begin{frame}{Problem set 2} - The focus is on writing functions and calling them. -\end{frame} - -\begin{frame}{Problem 2.1} +\subsection{Exercises} +\begin{frame}{Problem set 2: Problem 2.1} Write a function to return the gcd of two numbers. \end{frame} \begin{frame}{Problem 2.2} -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 should not be displayed by our program. \\ -Write a program to print primitive pythagorean triads. The program should generate all triads with a, b values in the range 0---100 +Write a program to print all primitive pythagorean triads (a, b, c) where a, b are in the range 1---100 \\ +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. \end{frame} \begin{frame}{Problem 2.3} - Write a program that generates a list of all four digit numbers that have all their digits even and are perfect squares.\\For example, the output should include 6400 but not 8100 (one digit is odd) or 4248 (not a perfect square). + 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).} \end{frame} \begin{frame}{Problem 2.4} - The aliquot of a number is defined as: the sum of the \emph{proper} divisors of the number. For example, the aliquot(12) = 1 + 2 + 3 + 4 + 6 = 16.\\ + The aliquot of a number is defined as: the sum of the \emph{proper} divisors of the number. For example, aliquot(12) = 1 + 2 + 3 + 4 + 6 = 16.\\ Write a function that returns the aliquot number of a given number. \end{frame} \begin{frame}{Problem 2.5} A pair of numbers (a, b) is said to be \alert{amicable} if the aliquot number of a is b and the aliquot number of b is a.\\ Example: \texttt{220, 284}\\ - Write a program that prints all five digit amicable pairs. + Write a program that prints all four digit amicable pairs. \inctime{25} \end{frame} @@ -277,8 +279,9 @@ Write a program to print primitive pythagorean triads. The program should genera % TIME: 25 m, running 55m %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -\subsection{Lists} +\section{Lists} +\subsection{Manipulating} \begin{frame}[fragile] \frametitle{List creation and indexing} \begin{lstlisting} @@ -286,8 +289,8 @@ Write a program to print primitive pythagorean triads. The program should genera >>> a = [1, 2, 3, 4] # More useful. >>> len(a) 4 ->>> a[0] + a[1] + a[2] + a[-1] -10 +>>> a[0] + a[1] + a[-1] +7 \end{lstlisting} \begin{itemize} \item Indices start with ? @@ -366,6 +369,7 @@ What do you think the last one will do? % TIME: 10 m, running 65m %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\subsection{Methods} \begin{frame}[fragile] \frametitle{List methods} \begin{lstlisting} @@ -403,6 +407,7 @@ True % TIME: 5 m, running 70m %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\section{Tuples} \begin{frame}[fragile] \frametitle{Tuples: immutable} \begin{lstlisting} @@ -412,7 +417,8 @@ True >>> t[0] = 1 Traceback (most recent call last): File "<stdin>", line 1, in ? -TypeError: object does not support item assignment +TypeError: object does not support +item assignment \end{lstlisting} \begin{itemize} \item Multiple return values are actually a tuple. @@ -425,6 +431,7 @@ TypeError: object does not support item assignment % TIME: 5 m, running 75m %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +\section{for and range()} \begin{frame}[fragile] \frametitle{\typ{range()} function} \begin{lstlisting} @@ -494,12 +501,13 @@ Try: \typ{print enumerate(a)} \begin{frame} \frametitle{What did we learn?} \begin{itemize} - \item Defining functions and calling them - \item Lists: Creating, Indexing, Slicing and List methods + \item Control flow in action + \item Functions + \item Manipulating Lists \item Tuples \item range() function \item for loops - \item iterating lists with for, for...range() + \item for...range() idiom \end{itemize} \end{frame} \end{document} diff --git a/day1/Session-4.tex b/day1/Session-4.tex index 8dd7150..c80d566 100755 --- a/day1/Session-4.tex +++ b/day1/Session-4.tex @@ -112,7 +112,7 @@ \titlepage \end{frame} -\section{Advanced Data structures, Functions and Debugging} +\section{Advanced Data structures} \subsection{Dictionary} \begin{frame}{Dictionary} @@ -120,7 +120,7 @@ \item lists and tuples index: 0 \ldots n \item dictionaries index using strings \item \typ{ d = \{ ``Hitchhiker's guide'' : 42, ``Terminator'' : ``I'll be back''\}} - \item \typ{d[``Terminator'']\\``I'll be back''} + \item \typ{d[``Terminator''] => ``I'll be back''} \item aka associative array, key-value pair, hashmap, hashtable \ldots \item what can be keys? \end{itemize} @@ -131,7 +131,7 @@ \item \alert{Unordered} \begin{block}{Standard usage} for key in dict:\\ - <use> dict[key] \# => value + \ \ \ \ print dict[key] \end{block} \item \typ{d.keys()} returns a list \item can we have duplicate keys? @@ -189,7 +189,6 @@ False \inctime{5} \end{frame} - \begin{frame} \frametitle{Problem set 6.2} \begin{description} @@ -199,7 +198,8 @@ False \inctime{10} \end{frame} -\subsection{Functions Reloaded!} + +\section{Functions Reloaded!} \begin{frame}[fragile] \frametitle{Advanced functions} \begin{itemize} @@ -211,6 +211,7 @@ False \end{itemize} \end{frame} +\subsection{Default arguments} \begin{frame}[fragile] \frametitle{Functions: default arguments} \small @@ -230,6 +231,7 @@ ask_ok('?', '[Y/N]') \end{lstlisting} \end{frame} +\subsection{Keyword arguments} \begin{frame}[fragile] \frametitle{Functions: keyword arguments} \small @@ -251,7 +253,7 @@ ask_ok(complaint='[y/n]', prompt='?') \inctime{15} \end{frame} -\subsection{Functional programming} +\section{Functional programming} \begin{frame}[fragile] \frametitle{Functional programming} \begin{itemize} @@ -263,6 +265,7 @@ ask_ok(complaint='[y/n]', prompt='?') \end{itemize} \end{frame} +\subsection{List comprehensions} \begin{frame}[fragile] \frametitle{List Comprehensions} Lets say we want to squares of all the numbers from 1 to 100 @@ -294,11 +297,22 @@ squares = [i*i for i in range(1, 100) if i % 10 in [1, 2, 5, 7]] \end{lstlisting} Which is more readable? -\inctime{15} \end{frame} +\begin{frame}[fragile] + \frametitle{map() function} + map() function accomplishes the same as list comprehensions + \begin{lstlisting} +>>> def square(x): return x*x +... +>>> map(square, range(1, 100)) +[1, 8, 27, 64, 125, 216, 343, 512, 729, 1000] + \end{lstlisting} +\inctime{15} +\end{frame} -\subsection{Debugging} +\section{Debugging} +\subsection{Errors and Exceptions} \begin{frame}[fragile] \frametitle{Errors} \begin{lstlisting} @@ -340,6 +354,7 @@ or modulo by zero \end{lstlisting} \end{frame} +\subsection{Strategy} \begin{frame}[fragile] \frametitle{Debugging effectively} \begin{itemize} @@ -352,7 +367,7 @@ or modulo by zero \begin{frame}[fragile] \frametitle{Debugging effectively} \begin{itemize} - \item Using \typ{\%debug} and \typ{\%pdb} in IPython + \item Using \typ{\%debug} in IPython \end{itemize} \end{frame} @@ -364,33 +379,51 @@ In [1]: import mymodule In [2]: mymodule.test() --------------------------------------------- NameError Traceback (most recent call last) -/media/python/iitb/workshops/day1/<ipython console> in <module>() -/media/python/iitb/workshops/day1/mymodule.py in test() +<ipython console> in <module>() +mymodule.py in test() 1 def test(): ----> 2 print spam NameError: global name 'spam' is not defined + In [3]: %debug -> /media/python/iitb/workshops/day1/mymodule.py(2)test() +> mymodule.py(2)test() 0 print spam ipdb> \end{lstlisting} \inctime{15} \end{frame} +\subsection{Exercise} \begin{frame}[fragile] \frametitle{Debugging: Exercise} +\small +\begin{lstlisting} +import keyword +f = open('/path/to/file') + +freq = {} +for line in f: + words = line.split() + for word in words: + key = word.strip(',.!;?()[]: ') + if keyword.iskeyword(key): + value = freq[key] + freq[key] = value + 1 + +print freq +\end{lstlisting} \inctime{10} \end{frame} \begin{frame} \frametitle{What did we learn?} \begin{itemize} - \item Creating and using Dictionaries - \item Creating and using Sets - \item Advances Functions: default arguments, keyword arguments + \item Dictionaries + \item Sets + \item Default and keyword arguments \item Functional Programming, list comprehensions \item Errors and Exceptions in Python - \item Debugging: \%pdb and \%debug in IPython + \item Debugging: \%debug in IPython \end{itemize} \end{frame} \end{document} diff --git a/day1/debug_exercise.py b/day1/debug_exercise.py index 8b0ff22..b8ae313 100644 --- a/day1/debug_exercise.py +++ b/day1/debug_exercise.py @@ -1,3 +1,13 @@ -def no_bug(): - for i in range(10): - if +import keyword +f = open('/path/to/file') + +freq = {} +for line in f: + words = line.split() + for word in words: + key = word.strip(',.!;?()[]: ') + if keyword.iskeyword(key): + value = freq[key] + freq[key] = value + 1 + +print freq diff --git a/day1/exercise/kwfreq.py b/day1/exercise/kwfreq.py index 32a8765..0da7ff3 100644 --- a/day1/exercise/kwfreq.py +++ b/day1/exercise/kwfreq.py @@ -1,5 +1,5 @@ import keyword -f = open('/home/madhu/pyprogs/pytriads.py') +f = open('/path/to/file') freq = {} for line in f: @@ -7,7 +7,7 @@ for line in f: for word in words: key = word.strip(',.!;?()[]: ') if keyword.iskeyword(key): - value = freq.get(key, 1) + value = freq[key] freq[key] = value + 1 print freq @@ -1,9 +1,151 @@ -\documentclass[a4paper,10pt]{book} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% Tutorial slides on Python. +% +% Author: FOSSEE <info at fossee dot in> +% Copyright (c) 2005-2009, FOSSEE Team +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + + +\documentclass[14pt,compress]{beamer} + +\mode<presentation> +{ + \useoutertheme{split} + \setbeamercovered{transparent} +} + +\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} + +\newcommand{\kwrd}[1]{ \texttt{\textbf{\color{blue}{#1}}} } + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +% Title page +\title[Basic Python]{Python: Quiz} + +\author[FOSSEE Team] {FOSSEE Authors} + +\institute[IIT Bombay] {Department of Aerospace Engineering\\IIT Bombay} +\date[] {11, October 2009\\Day 1, Session 0} +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% \begin{document} + +\begin{frame} + \titlepage +\end{frame} + +\begin{frame}{} + What is the biggest integer number that can be represented by Python? +\end{frame} + +\begin{frame}{} + What is the result of 17.0 / 2? +\end{frame} + +\begin{frame}{} + What does '*' * 40 produce? +\end{frame} + +\begin{frame}{} + Which of the following is not a type in Python? + \begin{enumerate} + \item int + \item float + \item char + \item string + \end{enumerate} +\end{frame} + +\begin{frame}[fragile]{} + What happens when we run this code? + \begin{lstlisting} +a = False +b = True +c = True +if a and b or c: + print "You are correct!" + \end{lstlisting} +\end{frame} + +\begin{frame}{} + What is the difference between print x and print x, ? +\end{frame} + +\begin{frame}{} + A single line of CSV file should be separated into fields. What method would you use to achieve this? +\end{frame} + +\begin{frame}{} + How many items can a function return? +\end{frame} + +\begin{frame}{} + If function returns more than one item/object what is the return type of the function? +\end{frame} + +\begin{frame}{} + Given a list a, what will its slice a[:-1] evaluate to? +\end{frame} + +\begin{frame}{} + How do you get a slice of the list where the slice has only alternate elements? +\end{frame} + +\begin{frame}{} + How do you combine 2 lists? +\end{frame} + +\begin{frame}{} + How do you find the presence of a given element in the list? +\end{frame} + +\begin{frame}{} + You are given a tuple a = (1, 2, 5, 7). What is the result of a[1] = 3? +\end{frame} + +\begin{frame}{} + We use \kwrd{for} to loop through the elements of a list. What do we have to do if we want to iterate through the elements of a list as well as get the index of the elements of the list as we iterate through? +\end{frame} + +\begin{frame}{} + What is the difference between import math and from math import *? +\end{frame} + +\begin{frame}{} + What can be the keys of a dictionary? +\end{frame} + +\begin{frame}{} + What happens when you try to access a key in the dictionary that does not exist? +\end{frame} + +\begin{frame}{} + How do you avoid such an exception? +\end{frame} + +\begin{frame}{} + How do you obtain all the keys of the dictionary? + \pause + \\all the values? +\end{frame} + +\begin{frame}{} + What will the set contain when you create a set from a list containing duplicate elements? +\end{frame} + +\end{document} + \begin{enumerate} - \item Which version of Python were you using? + \item Which version of Python were you using? \item List some key differences between IPython and Vanilla Python \item What is the biggest integer number that can be represented by Python? \item What is the result of 17.0 / 2? @@ -38,5 +180,4 @@ \item What will the set contain when you create a set from a list containing duplicate elements? \item Name any 2 types of Exception. \item Whats are the 2 IPython command you use for debugging? -\end{enumerate} -\end{document} +\end{enumerate}
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