how to check if key exist or not code example

Example 1: how to know if a key is in a dictionary python

dict = {"key1": 1, "key2": 2}

if "key1" in dict:

Example 2: check dictionary has key python

d = {"key1": 10, "key2": 23}

if "key1" in d:
    print("this will execute")

if "nonexistent key" in d:
    print("this will not")