check if a key in dictionary python 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: how to know if a key is in a dictionary python

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

if "key1" in dict:

Example 3: python dictionary contains key

if key in dictionary:
  print(True)