Pandas + Django + mod_wsgi + virtualenv

Question

当在虚拟环境中使用 django 和 mod_wsgi 时，导入 'module' object has no attribute 'core' 时，Pandas 出现问题。但在虚拟环境中运行 django 开发服务器时，它可以正常工作。其他模块（例如：numpy）没有问题，因此我认为这意味着虚拟环境已正确设置 mod_wsgi。如有建议，请指教。

staging.wsgi

import os
import sys
import site

PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
site_packages = os.path.join(PROJECT_ROOT, 'env/openportfolio/lib/python2.7/site-packages')
site.addsitedir(os.path.abspath(site_packages))
sys.path.insert(0, PROJECT_ROOT)
sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
os.environ['DJANGO_SETTINGS_MODULE'] = 'openportfolio.settings_staging'

import pandas #triggers error
import django.core.handlers.wsgi
application = django.core.handlers.wsgi.WSGIHandler()

错误

Traceback (most recent call last):
  File "/usr/local/web/django/www/staging/openportfolio/apache/staging.wsgi", line 22, in <module>
    import pandas
  File "/usr/local/web/django/www/staging/env/openportfolio/lib/python2.7/site-packages/pandas/__init__.py", line 12, in <module>
    from pandas.core.api import *
  File "/usr/local/web/django/www/staging/env/openportfolio/lib/python2.7/site-packages/pandas/core/api.py", line 6, in <module>
    import pandas.core.datetools as datetools
  AttributeError: 'module' object has no attribute 'core'  

Python路径

['/usr/local/web/django/www/staging/openportfolio',
 '/usr/local/web/django/www/staging',
 '/Library/Python/2.7/site-packages/pip-1.0.2-py2.7.egg',
 '/usr/local/web/django/www/staging/env/openportfolio/lib/python2.7/site-packages/setuptools-0.6c11-py2.7.egg',
 '/usr/local/web/django/www/staging/env/openportfolio/lib/python2.7/site-packages/pip-1.0.2-py2.7.egg',
 '/usr/local/web/django/www/staging/env/openportfolio/lib/python2.7/site-packages/matplotlib-1.1.0-py2.7-macosx-10.7-intel.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',
 '/usr/local/web/django/www/staging/env/openportfolio/lib/python2.7/site-packages']

- Evan Davey

---

你确定你已经安装了所有的依赖项并且构建了C扩展吗？通常当pandas依赖的某些内容无法导入时，我会看到这样的错误。 - Wes McKinney

它可以很好地导入并在不使用mod_wsgi时运行，因此这似乎是问题所在。我通过pip安装了它。 - Evan Davey

Answer 1

原来这是一个Python路径顺序问题。在我的wsgi配置文件中运行sys.path.reverse()后，代码现在可以运行了。

由于Python路径的顺序，内置的OS X numpy库必须首先被导入，而不是虚拟环境中的库，从而导致了问题。

在我的原始帖子中，我错过了'RuntimeError: module compiled against API version 6 but this version of numpy is 4'这一错误行，这可能有助于调试答案。

- Evan Davey