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-#+LaTeX_CLASS: beamer
-#+LaTeX_CLASS_OPTIONS: [presentation]
-#+BEAMER_FRAME_LEVEL: 1
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-#+LaTeX_CLASS_OPTIONS: [presentation]
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-#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
-
-#+LaTeX_HEADER: \usepackage{listings}
-
-#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,
-#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
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-
-#+TITLE:  Getting started with functions
-#+AUTHOR:  FOSSEE
-#+EMAIL:   info@fossee.in
-#+DATE:    
-
-#+DESCRIPTION: 
-#+KEYWORDS: 
-#+LANGUAGE:  en
-#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
-#+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc
-
-* Outline
-  - Define functions
-  - Pass arguments to functions
-  - Learn about docstrings
-  - Return values from functions
-
-* Function
-  - Eliminate code redundancy
-  - Help in code reuse
-  - Subroutine
-    - relatively independent of remaining code
-
-* ~f(x)~ a mathematical function
-
-  $f(x) = x^{2}$
-
-  : f(1) -> 1
-  : f(2) -> 4
-
-* Define ~f(x)~ in Python
-  #+begin_src python
-    def f(x):
-        return x*x
-  #+end_src
-
-  - ~def~ - keyword
-  - ~f~ - function name
-  - ~x~ - parameter / argument to function ~f~
-
-* Exercise 1
-
-  Write a python function named ~cube~ which computes the cube of a given
-  number ~n~.
-  
-  - Pause here and try to solve the problem yourself.
-
-* Solution
-  #+begin_src python
-    def cube(n):
-    	return n**3
-  #+end_src
-
-* ~greet~ function
-
- Function ~greet~ which will print ~Hello World!~.
- #+begin_src python
-    def greet():
-    	print "Hello World!"
- #+end_src
-  - Call the function ~greet~
-    : In []: greet()
-    : Hello World!
-
-* Exercise 2
-
-  Write a python function named ~avg~ which computes the average of
-  ~a~ and ~b~.
-
-  - Pause here and try to solve the problem yourself.
-
-* Solution 2
- #+begin_src python
-    def avg(a,b):
-    	return (a + b)/2
- #+end_src
-
- - ~a~ and ~b~ are parameters
- - ~def f(p1, p2, p3, ... , pn)~
-
-* Docstring
-
-  - Documenting/commenting code is a good practice
-   #+begin_src python
-     def avg(a,b):
-         """ avg takes two numbers as input 
-	 (a & b), and returns the average 
-	 of a and b"""
-	 return (a+b)/2
-   #+end_src
-  - Docstring
-    - written in the line after the ~def~ line.
-    - Inside triple quote.
-  - Documentation
-    : avg?
-* Exercise 3
-  Add docstring to the function f.
-
-* Solution 3
-
-#+begin_src python
-  def f(x):
-      """Accepts a number x as argument and,
-      returns the square of the number x."""
-      return x*x
-#+end_src
-
-* Exercise 4
-  Write a python function named ~circle~ which returns the area and
-  perimeter of a circle given radius ~r~.
-
-* Solution 4
-#+begin_src python
-  def circle(r):
-      """returns area and perimeter of a circle given 
-      radius r"""
-      pi = 3.14
-      area = pi * r * r
-      perimeter = 2 * pi * r
-      return area, perimeter
-#+end_src
-
-* ~what~
-#+begin_src python
-
- def what( n ):
-     if n < 0: n = -n
-     while n > 0:
-         if n % 2 == 1:
-             return False
-         n /= 10
-     return True
-#+end_src
-
-* ~even_digits~
-#+begin_src python
- def even_digits( n ):
-    """returns True if all the digits of number 
-    n is even returns False if all the digits 
-    of number n is not even"""
-     if n < 0: n = -n
-     while n > 0:
-         if n % 2 == 1:
-             return False
-         n /= 10
-     return True
-#+end_src
-
-* ~what~
-#+begin_src python
- def what( n ):
-     i = 1
-     while i * i < n:
-         i += 1
-     return i * i == n, i
-#+end_src
-
-* ~is_perfect_square~
-#+begin_src python
- def is_perfect_square( n ):
-     """returns True and square root of n, 
-     if n is a perfect square, otherwise 
-     returns False and the square root 
-     of the next perfect square"""
-     i = 1
-     while i * i < n:
-         i += 1
-     return i * i == n, i
-#+end_src
-
-* Summary
- - Functions in Python
- - Passing parameters to a function
- - Returning values from a function
-
- - We also did few code reading exercises.
-
-* Thank you!
-#+begin_latex
-  \begin{block}{}
-  \begin{center}
-  This spoken tutorial has been produced by the
-  \textcolor{blue}{FOSSEE} team, which is funded by the 
-  \end{center}
-  \begin{center}
-    \textcolor{blue}{National Mission on Education through \\
-      Information \& Communication Technology \\ 
-      MHRD, Govt. of India}.
-  \end{center}  
-  \end{block}
-#+end_latex