Antoine Pitrou added the comment:
Well, str.join() already optimizes this case to avoid copies:
>>> s = "x" * 50
>>> id(s)
139712615414000
>>> id(''.join([s]))
139712615414000
----------
nosy: +pitrou
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue1747670>
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