how to extract numbers from a list in python

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Marouane
26 Sep 2018
1a = ['1 2 3', '4 5 6', 'invalid']
2numbers = []
3for item in a:
4    for subitem in item.split():
5        if(subitem.isdigit()):
6            numbers.append(subitem)
7print(numbers)
8
9['1', '2', '3', '4', '5', '6']
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