def my_function_name():
  #Function code


//Calling it
my_function_name()

Using Parameters

def my_function_name(my_variable1, my_variable2):
  #Function code

//Calling it
my_function_name(21, "abc")

my_function_name(my_variable1=21, my_variable2="abc")
my_function_name(my_variable2="abc", my_variable1=21)

Default values

def my_function_name(my_variable1, my_variable2="abc"):
  #Function code

//Calling it
my_function_name(21)
my_function_name(21, "def")

Return values

def my_function_name():
  return 21

//Calling it
return_value = my_function_name()

Multiple return values

def my_function_name():
  return 21, "abc", 55

//Calling it
return_value_1, return_value_2, return_value_3 = my_function_name()