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>>> from numpy import log2, __version__<br>
>>> log2(2**63) <br>
Traceback (most recent call last): <br>
File "<stdin>", line 1, in <module> <br>
AttributeError: log2<br>
>>> __version__<br>
'2.0.0.dev-1fe8136'<br>
(doesn't work with 1.3.0 as well)<br>
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