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Python program to check if a given string is Keyword or not

Last Updated : 07 Jan, 2025

This article will explore how to check if a given string is a reserved keyword in Python. Using the keyword We can easily determine whether a string conflicts with Python’s built-in syntax rules.

Using iskeyword()

The keyword module in Python provides a function iskeyword() to check if a string is a keyword.

Python

import keyword

s = 'for'

# Check if it's a Python keyword
if keyword.iskeyword(s):
    print(f"'{s}' is a Python keyword.")
else:
    print(f"'{s}' is not a Python keyword.")

Output

'for' is a Python keyword.

Explanation:

The code uses keyword.iskeyword() to check if the input string (s) is a Python keyword.
It prints whether the string is a keyword or not based on the check.

Using `keyword.kwlist`

Checks if the string s is in keyword.kwlist and prints whether it’s a Python keyword.

Python

# Import the keyword module to access Python keywords
import keyword

s = "while"

# Check if the input string is in the list of Python keywords
if s in keyword.kwlist:
    # Print a message if the string is a Python keyword
    print(f"'{s}' is a Python keyword.")
else:
    
    print(f"'{s}' is not a Python keyword.")

Output

'while' is a Python keyword.

Explanation

The code imports the keyword module and checks if the string is in the keyword.kwlist to determine if it’s a Python keyword.
It prints a message indicating whether the string is a Python keyword based on the check.

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