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Editorial Team
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Asked: 2026-05-20T18:16:18+00:00

why can’t I do something like this: files = [file for file in [‘default.txt’].append(sys.argv[1:])

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why can’t I do something like this:

files = [file for file in ['default.txt'].append(sys.argv[1:]) if os.path.exists(file)]
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1 Answer

  1. Editorial Team

    list.append doesn’t return anything in Python:

    >>> l = [1, 2, 3]
>>> k = l.append(5)
>>> k
>>> k is None
True

    You may want this instead:

    >>> k = [1, 2, 3] + [5]
>>> k
[1, 2, 3, 5]
>>>

    Or, in your code:

    files = [file for file in ['default.txt'] + sys.argv[1:] if os.path.exists(file)]
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