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Diffstat (limited to 'slides')
25 files changed, 243 insertions, 237 deletions
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In[]: def greet(): - ....: print "Hello World!" + In[]: def greet(): + ....: print "Hello World!" ....: - In[]: greet() + In[]: greet() \end{lstlisting} \begin{itemize} \item \texttt{greet} is a function that takes no arguments @@ -51,11 +51,11 @@ \item But implicitly, Python returns \texttt{None} \end{itemize} \begin{lstlisting} - In[]: def avg(a, b): - ....: return (a + b)/2 + In[]: def avg(a, b): + ....: return (a + b)/2 ....: - In[]: avg(12, 10) + In[]: avg(12, 10) \end{lstlisting} \end{frame} @@ -66,15 +66,15 @@ \item We write a doc-string along with the function definition \end{itemize} \begin{lstlisting} - In[]: def avg(a, b): - """ avg takes two numbers as input - and returns their average""" + In[]: def avg(a, b): + """ avg takes two numbers as input + and returns their average""" - ....: return (a + b)/2 + ....: return (a + b)/2 ....: - In[]: avg? - In[]: greet? + In[]: avg? + In[]: greet? \end{lstlisting} \end{frame} @@ -85,20 +85,20 @@ \item Function needs to return two values \end{itemize} \begin{lstlisting} - In[]: def circle(r): - """returns area and perimeter of a - circle given, the radius r""" - - ....: pi = 3.14 - ....: area = pi * r * r - ....: perimeter = 2 * pi * r - ....: return area, perimeter + In[]: def circle(r): + """returns area and perimeter of a + circle given, the radius r""" + + ....: pi = 3.14 + ....: area = pi * r * r + ....: perimeter = 2 * pi * r + ....: return area, perimeter ....: - In[]: circle(4) - In[]: a, p = circle(6) - In[]: print a - In[]: print p + In[]: circle(4) + In[]: a, p = circle(6) + In[]: print a + In[]: print p \end{lstlisting} \begin{itemize} \item Any number of values can be returned @@ -108,13 +108,13 @@ \begin{frame}[fragile] \frametitle{What? -- 1} \begin{lstlisting} - In[]: def what( n ): - ....: if n < 0: n = -n - ....: while n > 0: - ....: if n % 2 == 1: - ....: return False - ....: n /= 10 - ....: return True + In[]: def what( n ): + ....: if n < 0: n = -n + ....: while n > 0: + ....: if n % 2 == 1: + ....: return False + ....: n /= 10 + ....: return True ....: \end{lstlisting} \end{frame} @@ -122,11 +122,11 @@ \begin{frame}[fragile] \frametitle{What? -- 2} \begin{lstlisting} - In[]: def what( n ): - ....: i = 1 - ....: while i * i < n: - ....: i += 1 - ....: return i * i == n, i + In[]: def what( n ): + ....: i = 1 + ....: while i * i < n: + ....: i += 1 + ....: return i * i == n, i ....: \end{lstlisting} \end{frame} @@ -139,8 +139,8 @@ In[]: round(2.484) In[]: round(2.484, 2) - In[]: s.split() # split on spaces - In[]: s.split(';') # split on ';' + In[]: s.split() # split on spaces + In[]: s.split(';') # split on ';' In[]: range(10) # returns numbers from 0 to 9 In[]: range(1, 10) # returns numbers from 1 to 9 @@ -151,8 +151,8 @@ \begin{frame}[fragile] \frametitle{Default arguments \ldots} \begin{lstlisting} - In[]: def welcome(greet, name="World"): - ....: print greet, name + In[]: def welcome(greet, name="World"): + ....: print greet, name ....: In[]: welcome("Hi", "Guido") @@ -163,8 +163,8 @@ \item The following definition is \alert{WRONG} \end{itemize} \begin{lstlisting} - In[]: def welcome(name="World", greet): - ....: print greet, name + In[]: def welcome(name="World", greet): + ....: print greet, name ....: \end{lstlisting} \end{frame} @@ -172,17 +172,17 @@ \begin{frame}[fragile] \frametitle{Keyword Arguments} \begin{lstlisting} - In[]: def welcome(greet, name="World"): - ....: print greet, name + In[]: def welcome(greet, name="World"): + ....: print greet, name ....: - In[]: welcome("Hello", "James") + In[]: welcome("Hello", "James") In[]: welcome("Hi", name="Guido") In[]: welcome(name="Guido", greet="Hey") - In[]: welcome(name="Guido", "Hey") + In[]: welcome(name="Guido", "Hey") \end{lstlisting} \end{frame} @@ -207,33 +207,21 @@ ....: print q ....: - In[]: change(1) - In[]: print q + In[]: change(1) + In[]: print q \end{lstlisting} \end{frame} \begin{frame}[fragile] \frametitle{Variables inside function are local} \begin{lstlisting} - In[]: n = 5 - In[]: def change(): - ....: n = 10 - ....: print n + In[]: n = 5 + In[]: def change(): + ....: n = 10 + ....: print n ....: - In[]: change() - In[]: print n - \end{lstlisting} - \begin{itemize} - \item Use the \texttt{global} statement to assign to global variables - \end{itemize} - \begin{lstlisting} - In[]: def change(): - ....: global n - ....: n = 10 - ....: print n - ....: - In[]: change() - In[]: print n + In[]: change() + In[]: print n \end{lstlisting} \end{frame} @@ -243,13 +231,13 @@ \item Use the \texttt{global} statement to assign to global variables \end{itemize} \begin{lstlisting} - In[]: def change(): - ....: global n - ....: n = 10 - ....: print n + In[]: def change(): + ....: global n + ....: n = 10 + ....: print n ....: - In[]: change() - In[]: print n + In[]: change() + In[]: print n \end{lstlisting} \end{frame} @@ -261,9 +249,9 @@ until the name is found \end{itemize} \begin{lstlisting} - In[]: name = ['Mr.', 'Steve', 'Gosling'] - In[]: def change_name(): - ....: name[0] = 'Dr.' + In[]: name = ['Mr.', 'Steve', 'Gosling'] + In[]: def change_name(): + ....: name[0] = 'Dr.' ....: In[]: change_name() In[]: print name @@ -273,22 +261,22 @@ \begin{frame}[fragile] \frametitle{Passing Arguments \ldots} \begin{lstlisting} - In[]: n = 5 - In[]: def change(n): - ....: n = 10 - ....: print "n = %s inside change " %n + In[]: n = 5 + In[]: def change(n): + ....: n = 10 + ....: print "n = %s inside change " %n ....: - In[]: change(n) - In[]: print n + In[]: change(n) + In[]: print n \end{lstlisting} \begin{lstlisting} - In[]: name = ['Mr.', 'Steve', 'Gosling'] - In[]: def change_name(n): - ....: n[0] = 'Dr.' - ....: print "n = %s inside change_name" %n + In[]: name = ['Mr.', 'Steve', 'Gosling'] + In[]: def change_name(n): + ....: n[0] = 'Dr.' + ....: print "n = %s inside change_name" %n ....: - In[]: change_name(name) - In[]: print name + In[]: change_name(name) + In[]: print name \end{lstlisting} \end{frame} diff --git a/slides/basic_python/intro.tex b/slides/basic_python/intro.tex index 52be064..a98cc19 100644 --- a/slides/basic_python/intro.tex +++ b/slides/basic_python/intro.tex @@ -22,14 +22,14 @@ \begin{frame}[fragile] \frametitle{Why Python?} \begin{itemize} - \item Extremely readable; Forces programmers to write readable code. - \item Interactive; Offers a very fast edit-test-debug cycle. + \item Extremely readable; Forces programmers to write readable code + \item Interactive; Offers a very fast edit-test-debug cycle \item Doesn't get in your way; High-level data structures let you focus on the problem \item Handles memory management \item Batteries included; Huge standard library for wide range of - tasks. - \item Object-oriented. + tasks + \item Object-oriented \item C, C++ and FORTRAN interfacing allows use of legacy code \item Your time is more valuable than machine time! \end{itemize} diff --git a/slides/basic_python/io_files_parsing.tex b/slides/basic_python/io_files_parsing.tex index cb46cbe..f766f1c 100644 --- a/slides/basic_python/io_files_parsing.tex +++ b/slides/basic_python/io_files_parsing.tex @@ -3,9 +3,9 @@ \begin{frame}[fragile] \frametitle{Printing} \begin{lstlisting} - In[]: a = "This is a string" - In[]: a - In[]: print a + In[]: a = "This is a string" + In[]: a + In[]: print a \end{lstlisting} \begin{itemize} \item Both \texttt{a}, and \texttt{print a} are showing the value @@ -15,19 +15,20 @@ \item In a script, it has no effect. \end{itemize} \begin{lstlisting} - In[]: b = "A line \n New line" - In[]: b - In[]: print b + In[]: b = "A line \n New line" + In[]: b + In[]: print b \end{lstlisting} \end{frame} \begin{frame}[fragile] \frametitle{String formatting} + \small \begin{lstlisting} In[]: x = 1.5 - In[]: y = 2 - In[]: z = "zed" - In[]: print "x is %2.1f y is %d z is %s" %(x, y, z) + In[]: y = 2 + In[]: z = "zed" + In[]: print "x is %2.1f y is %d z is %s" %(x, y, z) \end{lstlisting} \end{frame} @@ -42,7 +43,7 @@ In[]: print "Hello" In[]: print "World" - In[]: print "Hello", + In[]: print "Hello", In[]: print "World" \end{lstlisting} \begin{itemize} @@ -55,7 +56,7 @@ \begin{frame}[fragile] \frametitle{\texttt{raw\_input}} \begin{lstlisting} - In[]: ip = raw_input() + In[]: ip = raw_input() \end{lstlisting} \begin{itemize} \item The cursor is blinking; waiting for input @@ -69,17 +70,17 @@ \begin{frame}[fragile] \frametitle{\texttt{raw\_input} \ldots} \begin{lstlisting} - In[]: c = raw_input() - In[]: 5.6 + In[]: c = raw_input() + 5.6 In[]: c - In[]: type(c) + In[]: type(c) \end{lstlisting} \begin{itemize} \item \alert{\texttt{raw\_input} always takes a string} \end{itemize} \begin{lstlisting} - In[]: name = raw_input("Please enter your name: ") - George + In[]: name = raw_input("Enter your name: ") + Enter your name: George \end{lstlisting} \begin{itemize} \item \texttt{raw\_input} can display a prompt string for the user @@ -126,7 +127,7 @@ \item Close the file, when done; Also, if you want to read again \end{itemize} \begin{lstlisting} - In[]: f.close() + In[]: f.close() In[]: f \end{lstlisting} \end{frame} @@ -157,7 +158,7 @@ \end{lstlisting} \begin{itemize} \item File with records like the one above is given - \item Each record has fields separated by ; + \item Each record has fields separated by \verb+;+ \item region code; roll number; name; \item marks --- $1^{st}$ L; $2^{nd}$ L; math; science; social; total \item pass/fail indicated by P/F; W if withheld and else empty @@ -171,8 +172,8 @@ \begin{frame}[fragile] \frametitle{Tokenization} \begin{lstlisting} - In[]: line = "parse this string" - In[]: line.split() + In[]: line = "parse this string" + In[]: line.split() \end{lstlisting} \begin{itemize} \item Original string is split on white-space (if no argument) @@ -180,7 +181,7 @@ \item It can be given an argument to split on that argrument \end{itemize} \begin{lstlisting} - In[]: record = "A;015163;JOSEPH RAJ S;083;042;47;AA;72;244;;;" + In[]: record = "A;015163;JOSEPH RAJ S;083;042;47;AA;72;244;;;" In[]: record.split(';') \end{lstlisting} \end{frame} @@ -207,9 +208,9 @@ \item We need numbers to perform math operations \end{itemize} \begin{lstlisting} - In[]: mark_str = "1.25" - In[]: mark = int(mark_str) - In[]: type(mark_str) + In[]: mark_str = "1.25" + In[]: mark = int(mark_str) + In[]: type(mark_str) In[]: type(mark) \end{lstlisting} \begin{itemize} @@ -220,20 +221,20 @@ \begin{frame}[fragile] \frametitle{File parsing -- Solution} \begin{lstlisting} - In[]: math_B = [] # empty list to store marks + In[]: math_B = [] # empty list to store marks In[]: for line in open("sslc1.txt"): - ....: fields = line.split(";") + ....: fields = line.split(";") - ....: reg_code = fields[0] - ....: reg_code_clean = reg_code.strip() + ....: reg_code = fields[0] + ....: reg_code_clean = reg_code.strip() - ....: math_mark_str = fields[5] - ....: math_mark = float(math_mark_str) + ....: math_mark_str = fields[5] + ....: math_mark = float(math_mark_str) - ....: if reg_code == "B": - ....: math_B.append(math_mark) + ....: if reg_code == "B": + ....: math_B.append(math_mark) - In[]: math_B_mean = sum(math_B) / len(math_B) - In[]: math_B_mean + In[]: math_B_mean = sum(math_B) / len(math_B) + In[]: math_B_mean \end{lstlisting} \end{frame} diff --git a/slides/basic_python/python.tex b/slides/basic_python/python.tex index 19be639..446d38e 100644 --- a/slides/basic_python/python.tex +++ b/slides/basic_python/python.tex @@ -47,10 +47,10 @@ showstringspaces=false, keywordstyle=\color{blue}\bfseries} \tableofcontents \end{frame} -\include{slides/intro} -\include{slides/strings_loops_lists} -\include{slides/io_files_parsing} -\include{slides/func} -\include{slides/tuples_dicts_sets} +\include{intro} +\include{strings_loops_lists} +\include{io_files_parsing} +\include{func} +\include{tuples_dicts_sets} \end{document} diff --git a/slides/basic_python/strings_loops_lists.tex b/slides/basic_python/strings_loops_lists.tex index 26d7b54..1e5d05f 100644 --- a/slides/basic_python/strings_loops_lists.tex +++ b/slides/basic_python/strings_loops_lists.tex @@ -9,7 +9,7 @@ \end{itemize} \begin{lstlisting} In[]: 'This is a string' - In[]: "This is a string too' + In[]: "This is a string too" In[]: '''This is a string as well''' In[]: """This is also a string""" In[]: '' # empty string @@ -72,7 +72,7 @@ Given a list, \texttt{week}, containing names of the days of the week and a string \texttt{s}, check if the string is a day of the week. We should be able to check for any of the forms like, - \emph{sat, saturday, Sat, Saturday, SAT, SATURDAY} + \emph{sat, Sat, SAT} \end{block} \begin{itemize} \item Get the first 3 characters of the string @@ -84,7 +84,7 @@ \begin{frame}[fragile] \frametitle{Slicing} \begin{lstlisting} - In[]: q = "Hello World" + In[]: q = "Hello World" In[]: q[0:3] In[]: q[:3] In[]: q[3:] @@ -143,13 +143,13 @@ \item Possibly, each string separated by a common token \end{itemize} \begin{lstlisting} - In[]: email_list = ["info@fossee.in", + In[]: email_list = ["info@fossee.in", "enquiries@fossee.in", "help@fossee.in"] \end{lstlisting} \begin{lstlisting} - In[]: '; '.join(email_list) - In[]: ', '.join(email_list) + In[]: '; '.join(email_list) + In[]: ', '.join(email_list) \end{lstlisting} \end{frame} @@ -158,11 +158,11 @@ \begin{frame}[fragile] \frametitle{\texttt{if-else} block} \begin{lstlisting} - In[]: a = 5 - In[]: if a % 2 == 0: - ....: print "Even" - ....: else: - ....: print "Odd" + In[]: a = 5 + In[]: if a % 2 == 0: + ....: print "Even" + ....: else: + ....: print "Odd" \end{lstlisting} \begin{itemize} \item A code block -- \texttt{:} and indentation @@ -189,12 +189,12 @@ \begin{frame}[fragile] \frametitle{\texttt{else} is optional} \begin{lstlisting} - In[]: if user == 'admin': - ....: admin_Operations() - ....: elif user == 'moderator': - ....: moderator_operations() - ....: elif user == 'client': - ....: customer_operations() + In[]: if user == 'admin': + ....: admin_Operations() + ....: elif user == 'moderator': + ....: moderator_operations() + ....: elif user == 'client': + ....: customer_operations() \end{lstlisting} \begin{itemize} \item Note that there is no \texttt{else} block @@ -242,11 +242,11 @@ \texttt{while} \end{itemize} \begin{lstlisting} - In[]: i = 1 + In[]: i = 1 - In[]: while i<10: - ....: print i*i - ....: i += 2 + In[]: while i<10: + ....: print i*i + ....: i += 2 \end{lstlisting} \begin{itemize} \item The loops runs as long as the condition is \texttt{True} @@ -260,18 +260,18 @@ \texttt{for} \end{itemize} \begin{lstlisting} - In[]: for n in [1, 2, 3]: - ....: print n + In[]: for n in [1, 2, 3]: + ....: print n \end{lstlisting} \begin{itemize} \item \texttt{for} iterates over each element of a sequence \end{itemize} \begin{lstlisting} - In[]: for n in [1, 3, 5, 7, 9]: - ....: print n*n + In[]: for n in [1, 3, 5, 7, 9]: + ....: print n*n - In[]: for n in range(1, 10, 2): - ....: print n*n + In[]: for n in range(1, 10, 2): + ....: print n*n \end{lstlisting} \begin{itemize} \item \alert{range([start,] stop[, step])} @@ -288,13 +288,13 @@ \texttt{break} \end{itemize} \begin{lstlisting} - In[]: i = 1 + In[]: i = 1 - In[]: while True: - ....: print i*i - ....: i += 2 - ....: if i>10: - ....: break + In[]: while True: + ....: print i*i + ....: i += 2 + ....: if i>10: + ....: break \end{lstlisting} \end{frame} @@ -306,13 +306,31 @@ \item Squares of all odd numbers below 10, not multiples of 3 \end{itemize} \begin{lstlisting} - In[]: for n in range(1, 10, 2): - ....: if n%3 == 0: - ....: continue - ....: print n*n + In[]: for n in range(1, 10, 2): + ....: if n%3 == 0: + ....: continue + ....: print n*n \end{lstlisting} \end{frame} +\begin{frame}[fragile] + \frametitle{Problem - Day of the Week?} + \begin{itemize} + \item Strings have methods to manipulate them + \end{itemize} + \begin{block}{Problem} + Given a list, \texttt{week}, containing names of the days of the + week and a string \texttt{s}, check if the string is a day of the + week. We should be able to check for any of the forms like, + \emph{sat, saturday, Sat, Saturday, SAT, SATURDAY} + \end{block} + \begin{itemize} + \item Get the first 3 characters of the string + \item Convert it all to lower case + \item Check for existence in the list, \texttt{week} + \end{itemize} +\end{frame} + \section{Lists} @@ -333,10 +351,10 @@ \begin{frame}[fragile] \frametitle{Accessing Elements} \begin{lstlisting} - In[]: print p[0], p[1], p[3] + In[]: print p[0], p[1], p[3] - In[]: print p[-1], p[-2], p[-4] - In[]: print p[10] + In[]: print p[-1], p[-2], p[-4] + In[]: print p[10] \end{lstlisting} \begin{itemize} \item Indexing starts from 0 @@ -348,11 +366,11 @@ \begin{frame}[fragile] \frametitle{Accessing Elements \& length} \begin{lstlisting} - In[]: print p[0], p[1], p[3] + In[]: print p[0], p[1], p[3] In[]: print p[-1], p[-2], p[-4] In[]: print len(p) - In[]: print p[10] + In[]: print p[10] \end{lstlisting} \begin{itemize} \item Indexing starts from 0 @@ -368,9 +386,9 @@ \item The append method adds elements to the end of the list \end{itemize} \begin{lstlisting} - In[]: p.append('onemore') - In[]: p - In[]: p.append([1, 6]) + In[]: p.append('onemore') + In[]: p + In[]: p.append([1, 6]) In[]: p \end{lstlisting} \begin{itemize} @@ -390,10 +408,10 @@ \begin{frame}[fragile] \frametitle{Concatenating lists} \begin{lstlisting} - In[]: a = [1, 2, 3, 4] - In[]: b = [4, 5, 6, 7] - In[]: a + b - In[]: print a+b, a, b + In[]: a = [1, 2, 3, 4] + In[]: b = [4, 5, 6, 7] + In[]: a + b + In[]: print a+b, a, b \end{lstlisting} \begin{itemize} \item A new list is returned; None of the original lists change @@ -407,13 +425,13 @@ \begin{frame}[fragile] \frametitle{Slicing \& Striding} \begin{lstlisting} - In[]: primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29] - In[]: primes[4:8] - In[]: primes[:4] + In[]: primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29] + In[]: primes[4:8] + In[]: primes[:4] - In[]: num = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13] - In[]: num[1:10:2] - In[]: num[:10] + In[]: num = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13] + In[]: num[1:10:2] + In[]: num[:10] In[]: num[10:] In[]: num[::2] In[]: num[::-1] @@ -423,35 +441,35 @@ \begin{frame}[fragile] \frametitle{Sorting} \begin{lstlisting} - In[]: a = [5, 1, 6, 7, 7, 10] - In[]: a.sort() - In[]: a + In[]: a = [5, 1, 6, 7, 7, 10] + In[]: a.sort() + In[]: a \end{lstlisting} \begin{itemize} \item \texttt{sort} method sorts the list in-place \item Use \texttt{sorted} if you require a new list \end{itemize} \begin{lstlisting} - In[]: a = [5, 1, 6, 7, 7, 10] - In[]: sorted(a) - In[]: a + In[]: a = [5, 1, 6, 7, 7, 10] + In[]: sorted(a) + In[]: a \end{lstlisting} \end{frame} \begin{frame}[fragile] \frametitle{Reversing} \begin{lstlisting} - In[]: a = [5, 1, 6, 7, 7, 10] - In[]: a.reverse() - In[]: a + In[]: a = [5, 1, 6, 7, 7, 10] + In[]: a.reverse() + In[]: a \end{lstlisting} \begin{itemize} \item \texttt{reverse} method reverses the list in-place \item Use \texttt{[::-1]} if you require a new list \end{itemize} \begin{lstlisting} - In[]: a = [5, 1, 6, 7, 7, 10] - In[]: a[::-1] - In[]: a + In[]: a = [5, 1, 6, 7, 7, 10] + In[]: a[::-1] + In[]: a \end{lstlisting} \end{frame} diff --git a/slides/basic_python/tmp.tex b/slides/basic_python/tmp.tex deleted file mode 100644 index 8b13789..0000000 --- a/slides/basic_python/tmp.tex +++ /dev/null @@ -1 +0,0 @@ - diff --git a/slides/basic_python/tuples_dicts_sets.tex b/slides/basic_python/tuples_dicts_sets.tex index b09fd99..832a36c 100644 --- a/slides/basic_python/tuples_dicts_sets.tex +++ b/slides/basic_python/tuples_dicts_sets.tex @@ -3,15 +3,15 @@ \begin{frame}[fragile] \frametitle{Tuples -- Initialization} \begin{lstlisting} - In[]: t = (1, 2.5, "hello", -4, "world", 1.24, 5) - In[]: t + In[]: t = (1, 2.5, "hello", -4, "world", 1.24, 5) + In[]: t \end{lstlisting} \begin{itemize} \item It is not always necessary to use parenthesis \end{itemize} \begin{lstlisting} - In[]: a = 1, 2, 3 - In[]: b = 1, + In[]: a = 1, 2, 3 + In[]: b = 1, \end{lstlisting} \end{frame} @@ -30,26 +30,26 @@ \begin{frame}[fragile] \frametitle{Swapping values} \begin{lstlisting} - In[]: a = 5 - In[]: b = 7 + In[]: a = 5 + In[]: b = 7 - In[]: temp = a - In[]: a = b - In[]: b = temp + In[]: temp = a + In[]: a = b + In[]: b = temp \end{lstlisting} \begin{itemize} \item Here's the Pythonic way of doing it \end{itemize} \begin{lstlisting} - In[]: a, b = b, a + In[]: a, b = b, a \end{lstlisting} \begin{itemize} \item The variables can be of different data-types \end{itemize} \begin{lstlisting} - In[]: a = 2.5 - In[]: b = "hello" - In[]: a, b = b, a + In[]: a = 2.5 + In[]: b = "hello" + In[]: a, b = b, a \end{lstlisting} \end{frame} @@ -64,7 +64,7 @@ \item Tuple packing and unpacking, when swapping \end{itemize} \begin{lstlisting} - In[]: a, b = b, a + In[]: a, b = b, a \end{lstlisting} \end{frame} @@ -73,14 +73,14 @@ \begin{frame}[fragile] \frametitle{Creating Dictionaries} \begin{lstlisting} - In[]: mt_dict = {} + In[]: mt_dict = {} - In[]: extensions = {'jpg' : 'JPEG Image', + In[]: extensions = {'jpg' : 'JPEG Image', 'py' : 'Python script', 'html' : 'Html document', 'pdf' : 'Portable Document Format'} - In[]: extensions + In[]: extensions \end{lstlisting} \begin{itemize} \item Key-Value pairs @@ -91,13 +91,13 @@ \begin{frame}[fragile] \frametitle{Accessing Elements} \begin{lstlisting} - In[]: print extensions['jpg'] + In[]: print extensions['jpg'] \end{lstlisting} \begin{itemize} \item Values can be accessed using keys \end{itemize} \begin{lstlisting} - In[]: print extensions['zip'] + In[]: print extensions['zip'] \end{lstlisting} \begin{itemize} \item Values of non-existent keys cannot, obviously, be accessed @@ -163,9 +163,9 @@ \begin{frame}[fragile] \frametitle{Creating Sets} \begin{lstlisting} - In[]: a_list = [1, 2, 1, 4, 5, 6, 2] - In[]: a = set(a_list) - In[]: a + In[]: a_list = [1, 2, 1, 4, 5, 6, 2] + In[]: a = set(a_list) + In[]: a \end{lstlisting} \begin{itemize} \item Conceptually identical to the sets in mathematics @@ -177,8 +177,8 @@ \begin{frame}[fragile] \frametitle{Operations on Sets} \begin{lstlisting} - In[]: f10 = set([1, 2, 3, 5, 8]) - In[]: p10 = set([2, 3, 5, 7]) + In[]: f10 = set([1, 2, 3, 5, 8]) + In[]: p10 = set([2, 3, 5, 7]) \end{lstlisting} \begin{itemize} \item Mathematical operations performed on sets, can be performed @@ -186,19 +186,19 @@ \begin{itemize} \item Union \begin{lstlisting} - In[]: f10 | p10 + In[]: f10 | p10 \end{lstlisting} \item Intersection \begin{lstlisting} - In[]: f10 & p10 + In[]: f10 & p10 \end{lstlisting} \item Difference \begin{lstlisting} - In[]: f10 - p10 + In[]: f10 - p10 \end{lstlisting} \item Symmetric Difference \begin{lstlisting} - In[]: f10 ^ p10 + In[]: f10 ^ p10 \end{lstlisting} \end{itemize} \end{frame} @@ -208,12 +208,12 @@ \begin{itemize} \item Proper Subset \begin{lstlisting} - In[]: b = set([1, 2]) - In[]: b < f10 + In[]: b = set([1, 2]) + In[]: b < f10 \end{lstlisting} \item Subsets \begin{lstlisting} - In[]: f10 <= f10 + In[]: f10 <= f10 \end{lstlisting} \end{itemize} \end{frame} @@ -223,18 +223,18 @@ \begin{itemize} \item Containership \begin{lstlisting} - In[]: 1 in f10 - In[]: 4 in f10 + In[]: 1 in f10 + In[]: 4 in f10 \end{lstlisting} \item Iterating over elements \begin{lstlisting} - In[]: for i in f10: + In[]: for i in f10: ....: print i, ....: \end{lstlisting} \item Subsets \begin{lstlisting} - In[]: f10 <= f10 + In[]: f10 <= f10 \end{lstlisting} \end{itemize} \end{frame} @@ -246,13 +246,13 @@ all the duplicates \end{block} \begin{lstlisting} - In[]: marks = [20, 23, 22, 23, 20, 21, 23] - In[]: marks_set = set(marks) - In[]: for mark in marks_set: + In[]: marks = [20, 23, 22, 23, 20, 21, 23] + In[]: marks_set = set(marks) + In[]: for mark in marks_set: ....: marks.remove(mark) # left with only duplicates - In[]: duplicates = set(marks) + In[]: duplicates = set(marks) \end{lstlisting} \end{frame} |
