How to Remove Empty Strings from List in Python Easily

To remove empty strings from a list in Python, use a list comprehension that filters out empty strings by checking if each string is truthy. For example, [s for s in my_list if s] creates a new list without empty strings.

Syntax

The common syntax to remove empty strings from a list uses a list comprehension:

• [s for s in my_list if s]: Creates a new list including only strings that are not empty.

Here, my_list is your original list, s is each element, and if s checks if the string is not empty (non-empty strings are "truthy" in Python).

python

[s for s in my_list if s]

Example

This example shows how to remove empty strings from a list of strings using a list comprehension.

python

my_list = ["apple", "", "banana", "", "cherry", ""]
clean_list = [s for s in my_list if s]
print(clean_list)

Output

['apple', 'banana', 'cherry']

Common Pitfalls

One common mistake is trying to remove empty strings by comparing with an empty string using == inside a loop without creating a new list, which does not modify the original list correctly.

Another pitfall is using remove() inside a loop, which can cause skipping elements or errors.

python

my_list = ["apple", "", "banana", "", "cherry", ""]

# Wrong way: modifying list while iterating
for s in my_list[:]:
    if s == "":
        my_list.remove(s)

print(my_list)  # Output is ['apple', 'banana', 'cherry']

# Right way: use list comprehension
my_list = ["apple", "", "banana", "", "cherry", ""]
clean_list = [s for s in my_list if s]
print(clean_list)

Output

['apple', 'banana', 'cherry']
['apple', 'banana', 'cherry']

Quick Reference

Tips to remember when removing empty strings from lists:

• Use list comprehensions for clean and efficient filtering.
• Empty strings are "falsy" in Python, so if s filters them out.
• Avoid modifying lists while iterating over them.

Key Takeaways

Use list comprehensions with if s to remove empty strings efficiently.

Empty strings are considered false in Python, so filtering with if s works well.

Avoid removing items from a list while looping over it to prevent unexpected behavior.

Creating a new filtered list is safer and clearer than modifying the original list in place.