Modified slides of 'basic Python' and 'Advanced Python' .

1 files changed, 127 insertions, 95 deletions

diff --git a/basic_python/slides/func.tex b/basic_python/slides/func.tex
index f0ed1a5..b66be06 100644
--- a/basic_python/slides/func.tex
+++ b/basic_python/slides/func.tex
@@ -20,11 +20,12 @@
   \item Let's write a Python function, equivalent to this
   \end{itemize}
   \begin{lstlisting}
-    def f(x):
-        return x*x
+   In[]: def f(x):
+   ....:     return x*x
+   ....:
 
-    f(1)
-    f(2)
+   In[]: f(1)
+   In[]: f(2)
   \end{lstlisting}
   \begin{itemize}
   \item \texttt{def} is a keyword  
@@ -38,10 +39,11 @@
 \begin{frame}[fragile]
   \frametitle{Defining functions \ldots}
   \begin{lstlisting}
-    def greet():
-        print "Hello World!"
+  In[]:  def greet():
+  ....:      print "Hello World!"
+  ....:
 
-    greet()
+  In[]:  greet()
   \end{lstlisting}
   \begin{itemize}
   \item \texttt{greet} is a function that takes no arguments
@@ -49,10 +51,11 @@
   \item But implicitly, Python returns \texttt{None}
   \end{itemize}
   \begin{lstlisting}
-    def avg(a, b):
-        return (a + b)/2
-        
-    avg(12, 10)
+  In[]:  def avg(a, b):
+  ....:      return (a + b)/2
+  ....:
+      
+  In[]:  avg(12, 10)
   \end{lstlisting}
 \end{frame}
 
@@ -63,14 +66,15 @@
   \item We write a doc-string along with the function definition
   \end{itemize}
   \begin{lstlisting}
-    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
+  ....:
         
-    avg?
-    greet?
+  In[]:  avg?
+  In[]:  greet?
   \end{lstlisting}
 \end{frame}
 
@@ -81,19 +85,20 @@
   \item Function needs to return two values
   \end{itemize}
   \begin{lstlisting}
-    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
-
-    circle(4)
-    a, p = circle(6)
-    print a
-    print p
+  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
   \end{lstlisting}
   \begin{itemize}
   \item Any number of values can be returned
@@ -103,24 +108,26 @@
 \begin{frame}[fragile]
   \frametitle{What? -- 1}
   \begin{lstlisting}       
-    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}
 
 \begin{frame}[fragile]
   \frametitle{What? -- 2}
   \begin{lstlisting}
-    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}
 
@@ -129,50 +136,53 @@
 \begin{frame}[fragile]
   \frametitle{Default arguments}
   \begin{lstlisting}
-    round(2.484)
-    round(2.484, 2)
+  In[]: round(2.484)
+  In[]: round(2.484, 2)
 
-    s.split() # split on spaces
-    s.split(';') # split on ';'
+  In[]:  s.split() # split on spaces
+  In[]:  s.split(';') # split on ';'
 
-    range(10) # returns numbers from 0 to 9
-    range(1, 10) # returns numbers from 1 to 9
-    range(1, 10, 2) # returns odd numbers from 1 to 9
+  In[]: range(10) # returns numbers from 0 to 9
+  In[]: range(1, 10) # returns numbers from 1 to 9
+  In[]: range(1, 10, 2) # returns odd numbers from 1 to 9
   \end{lstlisting}
 \end{frame}
 
 \begin{frame}[fragile]
   \frametitle{Default arguments \ldots}
   \begin{lstlisting}
-    def welcome(greet, name="World"):
-        print greet, name
+  In[]:  def welcome(greet, name="World"):
+  ....:      print greet, name
+  ....:
 
-    welcome("Hi", "Guido")
-    welcome("Hello")
+  In[]: welcome("Hi", "Guido")
+  In[]: welcome("Hello")
   \end{lstlisting}
   \begin{itemize}
   \item Arguments with default values, should be placed at the end
   \item The following definition is \alert{WRONG}
   \end{itemize}
   \begin{lstlisting}
-    def welcome(name="World", greet):
-        print greet, name
+  In[]:  def welcome(name="World", greet):
+  ....:      print greet, name
+  ....:
   \end{lstlisting}
 \end{frame}
 
 \begin{frame}[fragile]
   \frametitle{Keyword Arguments}
   \begin{lstlisting}
-    def welcome(greet, name="World"):
-        print greet, name
+  In[]:  def welcome(greet, name="World"):
+  ....:      print greet, name
+  ....:
 
-    welcome("Hello", "James")
+  In[]:  welcome("Hello", "James")
 
-    welcome("Hi", name="Guido")
+  In[]: welcome("Hi", name="Guido")
 
-    welcome(name="Guido", greet="Hey")
+  In[]: welcome(name="Guido", greet="Hey")
 
-    welcome(name="Guido", "Hey")
+  In[]:  welcome(name="Guido", "Hey")
   \end{lstlisting}
 \end{frame}
 
@@ -192,39 +202,58 @@
 \begin{frame}[fragile]
   \frametitle{Arguments are local}
   \begin{lstlisting}
-    def change(q):
-        q = 10
-        print q
+   In[]: def change(q):
+   ....:     q = 10
+   ....:     print q
+   ....:
 
-    change(1)
-    print q
+  In[]:  change(1)
+  In[]:  print q
   \end{lstlisting}
 \end{frame}
 
 \begin{frame}[fragile]
   \frametitle{Variables inside function are local}
   \begin{lstlisting}
-    n = 5
-    def change():
-        n = 10
-        print n
-    change()
-    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}
-    def change():
-        global n
-        n = 10
-        print n
-    change()
-    print n
+  In[]:  def change():
+  ....:      global n
+  ....:      n = 10
+  ....:      print n
+  ....:
+  In[]:  change()
+  In[]:  print n
   \end{lstlisting}
 \end{frame}
 
 \begin{frame}[fragile]
+  \frametitle{global}
+ \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
+  \end{lstlisting}
+\end{frame}  
+
+\begin{frame}[fragile]
   \frametitle{Mutable variables}
   \begin{itemize}
   \item Behavior is different when assigning to a list element/slice
@@ -232,31 +261,34 @@
     until the name is found
   \end{itemize}
   \begin{lstlisting}
-    name = ['Mr.', 'Steve', 'Gosling']
-    def change_name():
-        name[0] = 'Dr.'
-    change_name()
-    print name
+  In[]:  name = ['Mr.', 'Steve', 'Gosling']
+  In[]:  def change_name():
+  ....:      name[0] = 'Dr.'
+  ....:
+  In[]: change_name()
+  In[]: print name
   \end{lstlisting}
 \end{frame}
 
 \begin{frame}[fragile]
   \frametitle{Passing Arguments \ldots}
   \begin{lstlisting}
-    n = 5
-    def change(n):
-        n = 10
-        print "n = %s inside change " %n
-    change(n)
-    print n
+  In[]:  n = 5
+  In[]:  def change(n):
+  ....:      n = 10
+  ....:      print "n = %s inside change " %n
+  ....:
+  In[]:  change(n)
+  In[]:  print n
   \end{lstlisting}
   
   \begin{lstlisting}
-    name = ['Mr.', 'Steve', 'Gosling']
-    def change_name(n):
-        n[0] = 'Dr.'
-        print "n = %s inside change_name" %n
-    change_name(name)
-    print name
+  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
   \end{lstlisting}
 \end{frame}