Python Program to Check if a Key is Already Present in a Dictionary

In this example, you will learn to check if a key is present in a dictionary.

To understand this example, you should have the knowledge of the following Python programming topics:

Using in keyword

my_dict = {1: 'a', 2: 'b', 3: 'c'}

if 2 in my_dict:
    print("present")

Output

present

Using if statement and in keyword, you can check if a key is present in a dictionary.

In the above example, 2 is present in the dictionary as a key; therefore, the output is present.

You can use not in if you want to check if a key is not present in the dictionary.

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