variable not updating in dictionary python 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 modify the dict in python

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

# updates the value of key 2
d.update(d1)
print(d)

d1 = {3: "three"}

# adds element with key 3
d.update(d1)
print(d)