尝试将 passlib 导入 python3 并失败:
$ pip freeze | grep lib
passlib==1.6.5
$ python3
Python 3.4.2 (default, Oct 8 2014, 10:45:20)
>>> import passlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named 'passlib'