python default arguments

1def my_function(name, age = 20):
2  print(name + " is " + str(age) + " years old"
3
4my_function("Mitro") # Mitro is 20 years old
5my_function("Mitro", 26) #Mitro is 26 years old

1def my_function(num1,num2=0):		#if num2 is not given, it will default it to zero
2  return num1 + num2
3
4print(my_function(1,2))				#prints out 3
5print(my_function(4))				#prints out 4 since num2 got defaulted to 0

1def your_function(arg,kwarg='default'):
2    return arg + kwarg

1def screen_size(screen_size=80):
2  return screen_aize
3
4screen_size(120)    # the screen size is 120
5screen_size()		# the screen size is 80 as default

1def F(a, b=None):
2    if b is None:
3        b = []
4    b.append(a)
5    return b

1def greet(name, msg="Good morning!"):
2    """
3    This function greets to
4    the person with the
5    provided message.
6
7    If the message is not provided,
8    it defaults to "Good
9    morning!"
10    """
11
12    print("Hello", name + ', ' + msg)
13
14
15greet("Kate")
16greet("Bruce", "How do you do?")