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Check if a string is empty in Python

Check if a string is empty in Python

David Y.

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The Problem

In Python, what is the most elegant way to check whether a string is empty?

The Solution

In Python, empty strings are considered equivalent to False for boolean operations. Therefore, we can use not to check whether a string is empty:

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if not my_string:
    print("my_string is empty!")
else:
    print("my_string is not empty!")

Note that this will only work in contexts where we know for certain that my_string contains a string. The expression in our if statement above would also evaluate to True if my_string contained the boolean value False, or even an empty list. If we want to ensure that my_string is an empty string and not a different false-equivalent value, we should do the following:

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if my_string == "":
    print("my_string is an empty string!")
else:
    print("my_string is not an empty string!")

A string containing only whitespace would not be considered empty by Python. If our code needs to consider " " and "" as equivalently empty strings, we can use string.strip with no arguments to remove whitespace before making the comparison.

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if my_string.strip() == "":
    print("my_string is an empty string!")
else:
    print("my_string is not an empty string!")
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