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

Python Program to Check if String is Empty or Not

Last Updated : 18 Nov, 2024

In this article, we will explore various methods to check if string is empty or not. The simplest and most commonly used approach is using comparison operator(==).

Using Comparison Operator(==)

s = ""

# Check if the string is empty
if s == "":
    print("The string is empty.")
else:
    print("The string is not empty.")

Output

The string is empty.

Explanation: A simple equality check (s == “”) determines if the string is empty.

Let’s explore other different method to check if string is empty or not:

Table of Content

Using len()
Using Python’s Truthy/Falsy Behavior

Using len()

The len() function returns the length of a string. If the length is 0 means string is empty.

s = ""

# Using len() to check if the string is empty
if len(s) == 0:
    print("The string is empty.")
else:
    print("The string is not empty.")

Output

The string is empty.

Explanation:

len(s): calculates the length of s.
If len(s) == 0 then the string is empty.

Using Python’s Truthy/Falsy Behavior

In Python, empty strings are treated as “Falsy”. So, we can use this for checking if a string is empty or not.

s = ""

# Check using truthy/falsy behavior
if not s:
    print("The string is empty.")
else:
    print("The string is not empty.")

Output

The string is empty.

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

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