Functions

Function without return

def PrintNumber(i):
    print(f"Number is {i}")

# print number 1-10
for i in range(1,11):
    PrintNumber(i)

function with return

def factor(number):
    value=1
    while number>1:
        value=value*number
        number=number-1
    return value

print(factor(3))

function with default parameter value

def factor(number=2):
    value=1
    while number>1:
        value=value*number
        number=number-1
    return value

print(factor())

function with variable inputs

• when we add * parameter before our inputvariable then python consider that input as tuple

  def sum(*numbers):
      total = 0
      for num in numbers:
          total = total+num
      return total
  
  print(sum(1, 2))
  print(sum(1, 2, 3, 4))
  

  3
  10
  

• when we add ** parameter before our inputvariable then python consider that input as dictionary

  def printdetails(name, **data):
      print(name)
      for key, value in data.items():
          print(f"Key: {key},Value: {value}")
  
  printdetails("vivek", age=31, city="surat")
  printdetails("vivek", age=31, city="surat", gender="Male", height=167)
  

Function with recursion

def factor(number):
    value=1
    if (number==0 or number==1):
        return value
    else :
        value=number*factor(number-1);
    return value

for i in range(6):
    print(factor(i))