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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