updating a dictionary code example

Example 1: python dict update

d = {1: "one", 2: "three"}
d1 = {2: "two"}

# updates the value of key 2
d.update(d1)
d1 = {3: "three"}
# adds element with key 3
d.update(d1)

# {1: 'one', 2: 'two', 3: 'three'}

Example 2: how to update dictionary in python

>> a = { "a" : 1, "b" : 2 }
>> b = { "c" : 3, "d" : 4 }
>> a
{'a': 1, 'b': 2}
>> b
{'c': 3, 'd': 4}
>> a.update(b)
>>a
{"a":1,"b":2,"c":3,"d":4}