How Can I Efficiently Remove Empty Strings from a Python List?

Pythonic Ways to Remove Empty Strings from a List

This discussion centers on removing empty strings from a given list of strings in Python. Initially, the approach considered was a while loop iteratively removing empty strings. However, seeking a more Pythonic solution led to exploring alternatives.

Using filter

A comprehensive solution lies in utilizing Python's filter function. Here are some variations:

• filter(None, str_list): Eliminates None values, essentially empty strings.
• filter(bool, str_list): Removes values that evaluate to False, including empty strings.
• filter(len, str_list): Retains strings with non-zero lengths, excluding empty strings.
• filter(lambda item: item, str_list): Implements a custom lambda function that returns True for non-empty strings and False for empty strings.

Considerations for Python 3

In Python 3, filter returns an iterator, requiring it to be converted into a list. This can be achieved through:

str_list = list(filter(None, str_list))

Employing any of these filter-based methods provides a Pythonic and efficient way to remove empty strings from a list in Python.

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