[Tutor] neat join

[Vincent Gulinao]

is there any simple syntax for joining strings such that if any (or all) of
the params is white space or None, it won't be included in the resulting
string?

e.g. str1, str2, str3 = "foo", "bar", None, if delimiter is " " would result
to "foo bar"; str1, str2 = None, None would result to None.

TIA.
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