How to Check if the String is Empty in Python?

How to Check if the String is Empty in Python?

Answer: The empty string in Python can be checked by the len() function, strip() function, and comparison operator ==.

Empty strings are usually found in the input given by the user, the data taken from an external source, and during the string manipulation process. An empty string is usually considered a ‘false’ meaning in a boolean context. Empty checks are most common in programming languages even in Python.

Table of Contents:

Methods to Check if the String is Empty in Python

Python provides various methods to check if a string is empty or not. Following are some of these methods explained with the help of examples:

Method 1: Using len() Function to Check if a String is Empty in Python

The len() method verifies the characters in strings; if the length is zero, the string is said to be empty.

Example: 

Python

Output:

image 553

Method 2: Using Comparison Operator ‘==’ to Check if a String is Empty in Python

When compared to other methods, it is the most straightforward. All we are doing is applying the equality check, which yields true if they are equal and false otherwise.

Example:

Python

Output: 

image 552

Method 3: Using the ‘not’ Operator to Check if a String is Empty in Python

In this method, if the string is evaluated as false, the string is considered to be empty. It is an alternative to the direct comparison method.

Example:

Python

Output: 

image 551

Method 4: Using __eq__ attribute to Check if a String is Empty in Python

It compares the two items’ equality and it is a special method. Internally, it functions similarly to the comparator operator “==” returns an empty string if the string is empty.

Example:

Python

Output: 

image 550

Method 5: Using isspace() Function to Check if a String is Empty in Python

The isspace() function returns “True” if the string contains only whitespace characters (e.g., spaces, tabs, newlines).

Example:

Python

Output:

image 549

Method 6: Using bool() Function to Check if a String is Empty in Python

The boolean value is returned by the built-in value, bool(). If the string is not empty, it returns true; if it is, it returns false.

Example:

Python

Output: 

image 548

Method 7: Using strip() Function to Check if a String is Empty in Python

You could be left with blank spaces when working with strings, which should also be regarded as an empty string. The Python function strip() will handle this.

Example: 

Python

Output:

image 547

Conclusion

Finding the empty string in your code base using the above-mentioned methods can be useful when working with strings. Every method provides a unique way of finding empty string and you can choose methods according to the use case.

 

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About the Author

Technical Research Analyst - Full Stack Development

Kislay is a Technical Research Analyst and Full Stack Developer with expertise in crafting Mobile applications from inception to deployment. Proficient in Android development, IOS development, HTML, CSS, JavaScript, React, Angular, MySQL, and MongoDB, he’s committed to enhancing user experiences through intuitive websites and advanced mobile applications.

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