1+ # Function is a piece of code of sequence of statements
2+ # Function is executed when it is called
3+ # Function works strictly with indentation
4+ # Function may or may not return a value
5+ # Function can have zero or more arguments passed
6+ # Function has to be defined before using it
7+ # Example:
8+ # def addition(a,b):
9+ # return a+b
10+ #
11+ # Calling function addition(2,4)
12+ # Multiple parameters can be passed.
13+ # Example: def my_fun(*a)
14+ # my_fun(1,2) or my_fun(3,4,5,6)
15+
16+ # Function without a body is defined as
17+ def do_nothing ():
18+ pass
19+
20+ do_nothing () # Calling function
21+
22+ # Print sum of two numbers
23+ def sum (a ,b ):
24+ return a + b
25+
26+ x = sum (2 ,3 ) #Calling function and assign value to x
27+ print (x ) #Prints 5
28+
29+ #Multiple Parameters
30+ def do_multiply (* a ):
31+ result = 1
32+ for i in a :
33+ print (type (a )) #prints <class 'tuple'> a is a tuple here
34+ result *= i
35+ return result
36+
37+ print (do_multiply (2 ,4 )) #Prints 8
38+ print (do_multiply (3 ,'Hi' )) #Prints HiHiHi
39+
40+
41+ # Keyword argument to paas the values
42+
43+ def ex_keyword_arg (a ,b ,c ):
44+ print ('Value of a:' ,a )
45+ print ('Value of b:' ,b )
46+ print ('Value of c:' ,c )
47+ print ('Sum of abc: ' , (a + b + c ))
48+
49+ ex_keyword_arg (2 ,4 ,5 ) #a=2, b=4, c=5 and sum is 11
50+ ex_keyword_arg (2 ,c = 4 ,b = 5 ) #a=2, b=5 , c=4 and sum is 11
51+
52+ # Function with default argument values
53+ def ex_default_arg (a ,b = 2 ,c = 6 ):
54+ print ('Value of a:' ,a )
55+ print ('Value of b:' ,b )
56+ print ('Value of c:' ,c )
57+ print ('Sum of abc: ' , (a + b + c ))
58+
59+ ex_default_arg (2 ) # sum of abc: 10
60+ ex_default_arg (2 ,5 ) # sum of abc: 13 (5 is assigned to b)
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