diff options
Diffstat (limited to 'basic_python/slides/tuples_dicts_sets.tex')
| -rw-r--r-- | basic_python/slides/tuples_dicts_sets.tex | 118 |
1 files changed, 60 insertions, 58 deletions
diff --git a/basic_python/slides/tuples_dicts_sets.tex b/basic_python/slides/tuples_dicts_sets.tex index 29dadba..b09fd99 100644 --- a/basic_python/slides/tuples_dicts_sets.tex +++ b/basic_python/slides/tuples_dicts_sets.tex @@ -3,24 +3,24 @@ \begin{frame}[fragile] \frametitle{Tuples -- Initialization} \begin{lstlisting} - t = (1, 2.5, "hello", -4, "world", 1.24, 5) - 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} - a = 1, 2, 3 - b = 1, + In[]: a = 1, 2, 3 + In[]: b = 1, \end{lstlisting} \end{frame} \begin{frame}[fragile] \frametitle{Indexing} \begin{lstlisting} - t[3] - t[1:5:2] - t[2] = "Hello" + In[]: t[3] + In[]: t[1:5:2] + In[]: t[2] = "Hello" \end{lstlisting} \begin{itemize} \item \alert{Tuples are immutable!} @@ -30,41 +30,41 @@ \begin{frame}[fragile] \frametitle{Swapping values} \begin{lstlisting} - a = 5 - b = 7 + In[]: a = 5 + In[]: b = 7 - temp = a - a = b - 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} - 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} - a = 2.5 - b = "hello" - a, b = b, a + In[]: a = 2.5 + In[]: b = "hello" + In[]: a, b = b, a \end{lstlisting} \end{frame} \begin{frame}[fragile] \frametitle{Tuple packing \& unpacking} \begin{lstlisting} - 5, + In[]: 5, - 5, "hello", 2.5 + In[]: 5, "hello", 2.5 \end{lstlisting} \begin{itemize} \item Tuple packing and unpacking, when swapping \end{itemize} \begin{lstlisting} - 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} - mt_dict = {} + In[]: mt_dict = {} - extensions = {'jpg' : 'JPEG Image', + In[]: extensions = {'jpg' : 'JPEG Image', 'py' : 'Python script', 'html' : 'Html document', 'pdf' : 'Portable Document Format'} - extensions + In[]: extensions \end{lstlisting} \begin{itemize} \item Key-Value pairs @@ -91,13 +91,13 @@ \begin{frame}[fragile] \frametitle{Accessing Elements} \begin{lstlisting} - print extensions['jpg'] + In[]: print extensions['jpg'] \end{lstlisting} \begin{itemize} \item Values can be accessed using keys \end{itemize} \begin{lstlisting} - print extensions['zip'] + In[]: print extensions['zip'] \end{lstlisting} \begin{itemize} \item Values of non-existent keys cannot, obviously, be accessed @@ -110,30 +110,30 @@ \item Adding a new key-value pair \end{itemize} \begin{lstlisting} - extensions['cpp'] = 'C++ code' - extensions + In[]: extensions['cpp'] = 'C++ code' + In[]: extensions \end{lstlisting} \begin{itemize} \item Deleting a key-value pair \end{itemize} \begin{lstlisting} - del extension['pdf'] - extensions + In[]: del extension['pdf'] + In[]: extensions \end{lstlisting} \begin{itemize} \item Assigning to existing key, modifies the value \end{itemize} \begin{lstlisting} - extensions['cpp'] = 'C++ source code' - extensions + In[]: extensions['cpp'] = 'C++ source code' + In[]: extensions \end{lstlisting} \end{frame} \begin{frame}[fragile] \frametitle{Containership} \begin{lstlisting} - 'py' in extensions - 'odt' in extensions + In[]: 'py' in extensions + In[]: 'odt' in extensions \end{lstlisting} \begin{itemize} \item Allow checking for container-ship of keys; NOT values @@ -144,16 +144,17 @@ \begin{frame}[fragile] \frametitle{Lists of Keys and Values} \begin{lstlisting} - extensions.keys() - extensions.values() + In[]: extensions.keys() + In[]: extensions.values() \end{lstlisting} \begin{itemize} \item Note that the order of the keys and values match \item That can be relied upon and used \end{itemize} \begin{lstlisting} - for each in extensions.keys(): - print each, "-->", extensions[each] + In[]: for each in extensions.keys(): + ....: print each, "-->", extensions[each] + ....: \end{lstlisting} \end{frame} @@ -162,9 +163,9 @@ \begin{frame}[fragile] \frametitle{Creating Sets} \begin{lstlisting} - a_list = [1, 2, 1, 4, 5, 6, 2] - a = set(a_list) - 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 @@ -176,8 +177,8 @@ \begin{frame}[fragile] \frametitle{Operations on Sets} \begin{lstlisting} - f10 = set([1, 2, 3, 5, 8]) - 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 @@ -185,19 +186,19 @@ \begin{itemize} \item Union \begin{lstlisting} - f10 | p10 + In[]: f10 | p10 \end{lstlisting} \item Intersection \begin{lstlisting} - f10 & p10 + In[]: f10 & p10 \end{lstlisting} \item Difference \begin{lstlisting} - f10 - p10 + In[]: f10 - p10 \end{lstlisting} \item Symmetric Difference \begin{lstlisting} - f10 ^ p10 + In[]: f10 ^ p10 \end{lstlisting} \end{itemize} \end{frame} @@ -207,12 +208,12 @@ \begin{itemize} \item Proper Subset \begin{lstlisting} - b = set([1, 2]) - b < f10 + In[]: b = set([1, 2]) + In[]: b < f10 \end{lstlisting} \item Subsets \begin{lstlisting} - f10 <= f10 + In[]: f10 <= f10 \end{lstlisting} \end{itemize} \end{frame} @@ -222,17 +223,18 @@ \begin{itemize} \item Containership \begin{lstlisting} - 1 in f10 - 4 in f10 + In[]: 1 in f10 + In[]: 4 in f10 \end{lstlisting} \item Iterating over elements \begin{lstlisting} - for i in f10: - print i, + In[]: for i in f10: + ....: print i, + ....: \end{lstlisting} \item Subsets \begin{lstlisting} - f10 <= f10 + In[]: f10 <= f10 \end{lstlisting} \end{itemize} \end{frame} @@ -244,13 +246,13 @@ all the duplicates \end{block} \begin{lstlisting} - marks = [20, 23, 22, 23, 20, 21, 23] - marks_set = set(marks) - for mark in marks_set: - marks.remove(mark) + 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 - duplicates = set(marks) + In[]: duplicates = set(marks) \end{lstlisting} \end{frame} |