python default value

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

1class Test:
2    def __init__(self, val, num = 0):
3        self.val = val
4        self.num = num
5
6# you can write this:
7
8t = Test(1)
9print(t.num) # prints 0
10
11# OR this
12
13t = Test(1, 2)
14print(t.num) # prints 2

1d = {'a': 1, 'b': 2}
2
3print(d.get('c', 3)) 	# 3

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

1d = defaultdict(lambda:1)