key and value checking in dictionary using if statement in 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: how to check if a key is present in python dictionary

dict = { "How":1,"you":2,"like":3,"this":4}
key = "this"
if key in dict.keys():
    print("present")
    print("value =",dict[key])
else:
    print("Not present")