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Tue Aug 24 18:43:11 CEST 2004 · https://mail.python.org/pipermail/python-dev/2004-August/048314.html

[M.-A. Lemburg]
> ...
> Aside: ''.join() currently only works for true sequences - not iterators.

>>> def gen():
...     for s in "sure", "it", "does":
...         yield s
...
>>> ' '.join(gen())
'sure it does'
>>> u' '.join(gen())
u'sure it does'
>>>

Every function implemented with PySequence_Fast() works with any
iterable, although it's fastest if the input argument is a builtin
list or tuple.  For anything else (including list or tuple subclasses,
and other "true sequences"), it materializes a temp tuple, via the
iterator protocol.

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Showing content from https://mail.python.org/pipermail/python-dev/2004-August/048314.html below:

[Python-Dev] Re: PEP 292 - Simpler String Substitutions