Python function to filter out empty strings from a list

Last update on April 22 2025 12:50:44 (UTC/GMT +8 hours)

5. Empty String Remover

Write a Python function that filters out all empty strings from a list of strings using the filter function.

Sample Solution:

Python Code:

def filter_non_empty_strings(strings):
    """
    Filters out all empty strings from a list of strings.

    Args:
        strings (list): A list of strings.

    Returns:
        list: A new list containing only non-empty strings.
    """
    # Define the filtering function
    def is_non_empty_string(s):
        return s.strip() != ""

    # Use the filter function to filter out empty strings
    non_empty_strings = list(filter(is_non_empty_string, strings))

    return non_empty_strings

# Example usage:
strings = ["", "w3resource", "Filter", "", "Python", ""]
print("Original list of strings:",strings)
print("\nA new list containing only non-empty strings:")
result = filter_non_empty_strings(strings)
print(result)

Explanation:

In the exercise above -

First, the "filter_non_empty_strings()" function takes a list of strings called strings as input.
Inside the function, we define a nested function "is_non_empty_string()" that checks if a string is non-empty by using the strip() method to remove leading and trailing whitespace and then checking if it's an empty string.
We use the filter() function to filter out empty strings from the strings list by applying the "is_non_empty_string()" function as the filtering condition.
The filtered 'non_empty_strings' are converted to a list and returned as the result.

Sample Output:

Original list of strings: ['', 'w3resource', 'Filter', '', 'Python', '']

A new list containing only non-empty strings:
['w3resource', 'Filter', 'Python']

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to filter out all empty strings and strings containing only whitespace from a list using the filter function.
Write a Python function that uses filter to remove strings that are either empty or contain only digits from a list.
Write a Python program to filter a list of strings to remove empty entries and then concatenate the remaining strings into a single sentence.
Write a Python program that filters out empty strings from a list and then trims extra whitespace from the remaining strings using the filter function.

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