• Function are the block of code that perform the specific task
• redundant coding is bad type of coding
• to create a function
• function takes input and returns output
• input as parameter and returns output(parameters as variables)
• and calling function give the argument to the function (give input as argument which means values
• Function definition , parameters ,function call, argument

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def (name for the function)

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Program for the average of 3 numbers

# average of 3 numbers 
def sume(var1,var2,var3):
  result = (var1 + var2 + var3)/3
  return result

print(sume(1,2,3))

Built in and user define function

• built in function are pre defined function like ( print(), len() , type(), range())
• user defined function are defined by the user

Default parameter

• in this case calling function give no argument to the function definition
• Because we assigned default value to the function definition this is know as default parameter

Practice program

1st program

• write a function to print the length of a string (list as a parameter)

cities = ["bellari", "ballari", "ballary", "bellary"]
phonenumbers = ["46484648", "118613128623154", "5444145226", "555452262211"]

def print_len(items):
    print(len(items))

print_len(cities)
print_len(phonenumbers)