Joining multiple strings if they are not empty in Python

python string join

>>> strings = ['foo','','bar','moo']>>> ' '.join(filter(None, strings))'foo bar moo'

By using None in the filter() call, it removes all falsy elements.

python string join

If you KNOW that the strings have no leading/trailing whitespace:

>>> strings = ['foo','','bar','moo']>>> ' '.join(x for x in strings if x)'foo bar moo'

otherwise:

>>> strings = ['foo ','',' bar', ' ', 'moo']>>> ' '.join(x.strip() for x in strings if x.strip())'foo bar moo'

and if any of the strings have non-leading/trailing whitespace, you may need to work harder still. Please clarify what it is that you actually have.

python string join

strings = ['foo','','bar','moo']' '.join([x for x in strings if x is not ''])'foo bar moo'

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