Functions
A function is like a mini program within
a program that performs a specific task.
Why functions?
- Creating a new function gives you an opportunity to name a group of statements, which makes your program easier to read, understand, and debug.
- A major purpose of functions is to group code that gets executed multiple times. Without a function defined, you would have to copy and paste this code each time.
Common Builtin Functions:
● abs()
● help()
● min()
● max()
● hex() hexadecimal representation of an integer
● bin() binary
● oct() octal
● id()
● input()
● int()
● float()
● str()
● print()
● bool()
● range()
● round()
● pow()
● sum()
● ord()
● len()
● type()
Common str methods:
● capitalize()
● count()
● encode()
● endswith()
● expandtabs()
● find()
● format()
● isalpha()
● isdigit()
● isdecimal()
● islower()
● isupper()
● join()
● startswith()
● swapcase()
● title()
User defined functions
Definition of a function
Syntax
def functionName(parameters) : statement(s)
● The keyword def introduces a function definition.
● It must be followed by the function name and the parenthesized list of formal parameters.
● There can be number of arguments in a function.
● The statements that form the body of the function start at the next line, and must be indented.