In this tutorial, we will look at how to check if a string is empty or not in Python with the help of some examples.
How to check if a string is an empty string?
A string is empty if it does not contain any characters. You can use the following methods to check if a string is empty or not in Python.
- Comparing the string with an empty string.
- Using the
len()function. - Using the string in a boolean context.
Let’s now take a look at each of the above methods with the help of some examples.
Comparing the string with an empty string
You can also check if a string is empty or not by comparing it with an empty string, "" using the == operator. Let’s look at an example.
# create two strings - s1 empty and s2 non-empty s1 = "" s2 = "cat" # check if string is empty print(s1 == "") print(s2 == "")
Output:
True False
We get True as the output for the string s1 as it is empty and False for the string s2 because it’s not empty (it contains some characters).
Using the len() function
The length of an empty string is zero.
You can use the Python len() function to calculate the length of the string and then compare it with zero to check if it is empty or not. Here’s an example –
Introductory ⭐
- Harvard University Data Science: Learn R Basics for Data Science
- Standford University Data Science: Introduction to Machine Learning
- UC Davis Data Science: Learn SQL Basics for Data Science
- IBM Data Science: Professional Certificate in Data Science
- IBM Data Analysis: Professional Certificate in Data Analytics
- Google Data Analysis: Professional Certificate in Data Analytics
- IBM Data Science: Professional Certificate in Python Data Science
- IBM Data Engineering Fundamentals: Python Basics for Data Science
Intermediate ⭐⭐⭐
- Harvard University Learning Python for Data Science: Introduction to Data Science with Python
- Harvard University Computer Science Courses: Using Python for Research
- IBM Python Data Science: Visualizing Data with Python
- DeepLearning.AI Data Science and Machine Learning: Deep Learning Specialization
Advanced ⭐⭐⭐⭐⭐
- UC San Diego Data Science: Python for Data Science
- UC San Diego Data Science: Probability and Statistics in Data Science using Python
- Google Data Analysis: Professional Certificate in Advanced Data Analytics
- MIT Statistics and Data Science: Machine Learning with Python - from Linear Models to Deep Learning
- MIT Statistics and Data Science: MicroMasters® Program in Statistics and Data Science
🔎 Find Data Science Programs 👨💻 111,889 already enrolled
Disclaimer: Data Science Parichay is reader supported. When you purchase a course through a link on this site, we may earn a small commission at no additional cost to you. Earned commissions help support this website and its team of writers.
# create two strings - s1 empty and s2 non-empty s1 = "" s2 = "cat" # check if string is empty print(len(s1) == 0) print(len(s2) == 0)
Output:
True False
We get the same results as above.
String in a boolean context
If you use a string in a boolean context, it will evaluate to True if it has any characters and it will evaluate to False if it is empty. Thus, you can use the expression not s to check if the string s is empty or not.
Here’s an example.
# create two strings - s1 empty and s2 non-empty s1 = "" s2 = "cat" # check if string is empty print(not s1) print(not s2)
Output:
True False
We get the same result as above. True for the string s1 as it’s empty and False for the string s2 as it’s not empty (s2 has three characters).
In this tutorial, we looked at three methods to check if a string is empty or not. Use the method that you are the most comfortable with.
You might also be interested in –
- Python – Check If a List is Empty – With Examples
- Python – Check If Set Is Empty – With Examples
- Check If a Tuple Is Empty in Python
- Check If a Dictionary Is Empty In Python
Subscribe to our newsletter for more informative guides and tutorials.
We do not spam and you can opt out any time.
