python dictionary check if key does ont exists code example

Example 1: check if dict key exists python

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

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

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

Example 2: python check if key exist in json

json_string = """{"a": 1, "b": 2, "c": 3}"""
a_dictionary = json.loads(json_string)

b_in_dict =  "b" in a_dictionary