We can add new entries in a dictionary by simply assigning a value to a key. Python automatically creates the entry.
If a value already exists at this key, it will be updated:
xxxxxxxxxx
phone_book = {"Batman": 468426,
"Cersei": 237734,
"Ghostbusters": 44678}
print(phone_book)
phone_book["Godzilla"] = 46394 # New entry
print(phone_book)
phone_book["Godzilla"] = 9000 # Updating entry
print(phone_book)