Inada Naoki <[email protected]> added the comment:
> Strangely enough, it worked in Python 2.7
It is not strange since dict.keys() in Python 2.7 returns list.
>>> {}.viewkeys() | Ror()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: iteration over non-sequence
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<https://bugs.python.org/issue38538>
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