Function.md

Function

User-Defined Function

Parameter vs Argument

• Parameter: Defined with function
• Argument: Passed as value during the function call.

def function(parameter1, parameter2):
    """
    This is a Doctstring
    """
    print("The Message")

greet(argument1, argument2)

Arbitrary Arguments

• When we don't know how many arguments we will pass.

def greet(*people):
    """
    Docstring
    parameters (data type): about parameter
    """

    # people is an iterator with arguments (list, tuple, set, string)
    for name in people:
        print("Hello", name)

greet("Kirankumar", "Paramveer", "Gaurav", "Pranit")

Global Keyword

• Variable created inside a function is a local variable by default.
• Variable created outside a function is a global variable by default.
• Keyword gobal is used to declare global variable inside a function.

# global variable:
c = 1 

def add():
    # use of global keyword:
    global c
    # increment c by 2:
    c = c + 2 
    print(c)

add()