STINNER Victor added the comment:
Importing a module looks slow to me. Importing a module which is a an *empty*
.py file takes ~160 us.
$ python3 -I -m timeit -s "open('slow.py', 'wb').close(); import sys; import
slow" "del sys.modules['slow']; import slow"
10000 loops, best of 3: 156 usec per loop
The difference betwen Python 3.4 and 3.5 is that enum.py imports indirectly
more modules. The following two imports were added to types.py in Python 3.5:
import functools as _functools
import collections.abc as _collections_abc
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<http://bugs.python.org/issue25159>
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