我通常运行python2，但我正在使用python3。现在，我对为什么收到此错误感到困惑。

当我./test_web_events.py在tests目录中运行命令时，我得到：

Traceback (most recent call last):
  File "./test_web_events.py", line 21, in <module>
    import qe.util.scratchstore as scratchstore
ImportError: No module named 'qe'

但是我的项目结构中有qe目录：

/python_lib
   Makefile
   /qe
      __init__.py
      /tests
         __init__.py
         test_web_events.py
      /util
         __init__.py
         scratchstore.py
      /trinity
         __init__.py

我尝试将/tests目录移入，/python_lib但是仍然出现相同的错误：

MTVL1289dd026:python_lib bli1$ ls
Makefile    qe      rundata     setup.sh    tests
MTVL1289dd026:python_lib bli1$ python3 tests/test_web_events.py 
Traceback (most recent call last):
  File "tests/test_web_events.py", line 21, in <module>
    import qe.util.scratchstore as scratchstore
ImportError: No module named 'qe'

这是我sys.path的python2

>>> import sys
>>> print sys.path
['', '/Library/Python/2.7/site-packages/pip-1.5.6-py2.7.egg', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', '/Library/Python/2.7/site-packages']

sys.path 对于python3

>>> print(sys.path)
['', '/Library/Frameworks/Python.framework/Versions/3.4/lib/python34.zip', '/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4', '/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/plat-darwin', '/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/lib-dynload', '/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages']