Joining multiple strings if they are not empty in Python

Question

I have four strings and any of them can be empty. I need to join them into one string with spaces between them. If I use:

new_string = string1 + \' \' + stri         


        

Answer 1

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

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