python - 安装了 patsy，仍然无法安装 statsmodels

Question

当我执行 pip install statsmodels 时，它给我 ImportError: statsmodels requires patsy。 http://patsy.readthedocs.org，但后来我运行 pip install patsy 它说它成功了，但是运行 pip install statsmodels 仍然给我同样的结果关于要求 patsy 的错误。

这怎么可能？

---

$ sudo pip install patsy
Requirement already satisfied (use --upgrade to upgrade): patsy in /Library/Python/2.7/site-packages/patsy-0.3.0-py2.7.egg
Requirement already satisfied (use --upgrade to upgrade): numpy in /Library/Python/2.7/site-packages/numpy-1.8.2-py2.7-macosx-10.9-intel.egg (from patsy)
Cleaning up...
$ sudo pip install statsmodels
Downloading/unpacking statsmodels
  Downloading statsmodels-0.5.0.tar.gz (5.5MB): 5.5MB downloaded
  Running setup.py (path:/private/tmp/pip_build_root/statsmodels/setup.py) egg_info for package statsmodels
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/private/tmp/pip_build_root/statsmodels/setup.py", line 463, in <module>
        check_dependency_versions(min_versions)
      File "/private/tmp/pip_build_root/statsmodels/setup.py", line 122, in check_dependency_versions
        raise ImportError("statsmodels requires patsy. http://patsy.readthedocs.org")
    ImportError: statsmodels requires patsy. http://patsy.readthedocs.org
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/private/tmp/pip_build_root/statsmodels/setup.py", line 463, in <module>

    check_dependency_versions(min_versions)

  File "/private/tmp/pip_build_root/statsmodels/setup.py", line 122, in check_dependency_versions

    raise ImportError("statsmodels requires patsy. http://patsy.readthedocs.org")

ImportError: statsmodels requires patsy. http://patsy.readthedocs.org

----------------------------------------
Cleaning up...
Command python setup.py egg_info failed with error code 1 in /private/tmp/pip_build_root/statsmodels
Storing debug log for failure in /Users/Jacob/Library/Logs/pip.log

Answer 1

错误消息没有告诉您的是模块 six 不存在才是真正的问题。

通过执行 import patsy 并让它失败并告诉我我需要 6 来发现这一 pip 。所以我执行了 pip install six，现在 patsy 导入工作正常，pip install statsmodels 也是如此。