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Python | Split strings and digits from string list
• Last Updated : 02 Dec, 2019

Sometimes, while working with String list, we can have a problem in which we need to remove the surrounding stray characters or noise from list of digits. This can be in form of Currency prefix, signs of numbers etc. Let’s discuss a way in which this task can be performed.

Method : Using list comprehension + `strip() + isdigit() + join()`
The combination of above functions can be used to perform this task. In this, we strip the stray characters from numbers that are identified from the strings and return the result.

 `# Python3 code to demonstrate working of``# Extract digit from string list ``# using list comprehension + strip() + isdigit() + join()``from` `itertools ``import` `groupby`` ` `# initialize list ``test_list ``=` `[``"-4"``, ``"Rs 25"``, ``"5 kg"``, ``"+15"``]`` ` `# printing original list ``print``(``"The original list : "` `+` `str``(test_list))`` ` `# Extract digit from string list ``# using list comprehension + strip() + isdigit() + join()``res ``=` `[''.join(j).strip() ``for` `sub ``in` `test_list ``        ``for` `k, j ``in` `groupby(sub, ``str``.isdigit)]`` ` `# printing result``print``(``"List after removing stray characters : "` `+` `str``(res))`
Output :
```The original list : ['-4', 'Rs 25', '5 kg', '+15']
List after removing stray characters : ['-', '4', 'Rs', '25', '5', 'kg', '+', '15']
```

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