defining functions

eg. 1 - Function with no arguments and no return value	def say_hello(): print("Hello") # call it by say_hello()
eg. 2 - Function with argument(s) and no return value	def say_hello(yourname): print("Hello {}".format(yourname)) # call it by say_hello("James")
e.g. 3 - Function with argument(s) having a default value and no return value	def say_hello(yourname="John Doe"): print("Hello {}".format(yourname)) # call with value say_hello("Mary") # call with default value say_hello()
e.g. 4 Function with argument(s) and return value	def timesfive(x): return 5*x # call and use the return value x = 2 answer = timesfive(x)