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# Python – Extract Strings with a digit

• Last Updated : 01 Oct, 2020

Given a Strings List, extract those with atleast one digit.

Input : test_list = [‘gf4g’, ‘is’, ‘best’, ‘gee1ks’]
Output : [‘gf4g’, ‘gee1ks’]
Explanation : 4, 1 are respective digits in string.

Input : test_list = [‘gf4g’, ‘is’, ‘best’, ‘geeks’]
Output : [‘gf4g’]
Explanation : 4 is digit in string.

Method #1 : Using list comprehension + any() + isdigit()

In this iteration for each string is done using list comprehension, any() and isdigit() is used for task of checking at least one digit.

## Python3

 `# Python3 code to demonstrate working of``# Extract Strings with a digit``# Using list comprehension + any() + isdigit()`` ` `# initializing list``test_list ``=` `[``'gf4g'``, ``'is'``, ``'best'``, ``'4'``, ``'gee1ks'``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# checking if string contain any string using any()``res ``=` `[sub ``for` `sub ``in` `test_list ``if` `any``(ele ``for` `ele ``in` `sub ``if` `ele.isdigit())]`` ` `# printing result``print``(``"Strings with any digit : "` `+` `str``(res))`

Output:

The original list is : [‘gf4g’, ‘is’, ‘best’, ‘4’, ‘gee1ks’]
Strings with any digit : [‘gf4g’, ‘4’, ‘gee1ks’]

Method #2 : Using any() + filter() + lamdba

In this, we perform task of filtering using lambda and filter(), rest remains the same.

## Python3

 `# Python3 code to demonstrate working of``# Extract Strings with a digit``# Using any() + filter() + lamdba`` ` `# initializing list``test_list ``=` `[``'gf4g'``, ``'is'``, ``'best'``, ``'4'``, ``'gee1ks'``]`` ` `# printing original list``print``(``"The original list is : "` `+` `str``(test_list))`` ` `# checking if string contain any string using any()``# filter() used to filter strings with digits``res ``=` `list``(``filter``(``lambda` `sub: ``any``(``    ``ele ``for` `ele ``in` `sub ``if` `ele.isdigit()), test_list))`` ` `# printing result``print``(``"Strings with any digit : "` `+` `str``(res))`

Output:

The original list is : [‘gf4g’, ‘is’, ‘best’, ‘4’, ‘gee1ks’]
Strings with any digit : [‘gf4g’, ‘4’, ‘gee1ks’]

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