How to Extract Strings Containing a Specific Substring in Python?

Identifying Strings Containing a Specific Substring

To extract a list of specific strings that contain a given substring, we can leverage Python's powerful filtering capabilities. One effective approach is to utilize list comprehensions, as demonstrated below:

<code class="python">lst = ['a', 'ab', 'abc', 'bac']
[k for k in lst if 'ab' in k]</code>

This comprehension method conveniently filters the list, retaining only those strings that include the substring 'ab'. The result is a new list containing:

['ab', 'abc']

An alternative approach is to employ the filter function, which offers a concise solution:

<code class="python">list(filter(lambda k: 'ab' in k, lst))</code>

In Python 2, the filter function returns an iterator, which can be cast to a list using the list function. In Python 3, the filter function returns an iterator by default.

While both methods achieve the same desired outcome, list comprehensions are generally considered a more concise and Pythonic way to filter lists, as they provide a straightforward and readable implementation.

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