check if key is not in dictionary python 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 if dict key contains specific key and value

if (key, value) in d.items():
	print("yes")

Example 3: check if a key exists in a dictionary python

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

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

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