python - virtualenv 不会为 python 2.7 符号链接(symbolic link) warnings.py

Question

我在 Lucid 上使用 python2.7 创建 virtualenv (1.5.2) 时遇到问题。似乎 virtualenv 正在跳过为 warnings.py 创建符号链接(symbolic link)。

Running virtualenv with interpreter /usr/local/bin/python2.7
Creating test/lib/python2.7
Symlinking Python bootstrap modules
  Symlinking test/lib/python2.7/sre_compile.pyc
  Symlinking test/lib/python2.7/encodings
  Symlinking test/lib/python2.7/UserDict.pyc
  Symlinking test/lib/python2.7/stat.pyo
  Symlinking test/lib/python2.7/copy_reg.pyo
  Symlinking test/lib/python2.7/posixpath.py
  Symlinking test/lib/python2.7/stat.pyc
  Symlinking test/lib/python2.7/re.py
  Symlinking test/lib/python2.7/sre_parse.pyo
  Symlinking test/lib/python2.7/sre_constants.pyo
  Symlinking test/lib/python2.7/codecs.py
  Symlinking test/lib/python2.7/lib-dynload
  Symlinking test/lib/python2.7/locale.py
  Symlinking test/lib/python2.7/sre.pyc
  Symlinking test/lib/python2.7/ntpath.pyo
  Symlinking test/lib/python2.7/types.pyo
  Symlinking test/lib/python2.7/config
  Symlinking test/lib/python2.7/sre_parse.py
  Symlinking test/lib/python2.7/genericpath.pyc
  Symlinking test/lib/python2.7/sre.py
  Symlinking test/lib/python2.7/copy_reg.pyc
  Symlinking test/lib/python2.7/sre.pyo
  Symlinking test/lib/python2.7/sre_constants.py
  Symlinking test/lib/python2.7/types.pyc
  Symlinking test/lib/python2.7/UserDict.pyo
  Symlinking test/lib/python2.7/ntpath.pyc
  Symlinking test/lib/python2.7/fnmatch.py
  Symlinking test/lib/python2.7/os.pyo
  Symlinking test/lib/python2.7/codecs.pyo
  Symlinking test/lib/python2.7/os.pyc
  Symlinking test/lib/python2.7/fnmatch.pyo
  Symlinking test/lib/python2.7/genericpath.pyo
  Symlinking test/lib/python2.7/UserDict.py
  Symlinking test/lib/python2.7/re.pyc
  Symlinking test/lib/python2.7/genericpath.py
  Symlinking test/lib/python2.7/fnmatch.pyc
  Symlinking test/lib/python2.7/sre_compile.pyo
  Symlinking test/lib/python2.7/posixpath.pyc
  Symlinking test/lib/python2.7/os.py
  Symlinking test/lib/python2.7/re.pyo
  Symlinking test/lib/python2.7/sre_parse.pyc
  Symlinking test/lib/python2.7/types.py
  Symlinking test/lib/python2.7/sre_compile.py
  Symlinking test/lib/python2.7/sre_constants.pyc
  Symlinking test/lib/python2.7/copy_reg.py
  Symlinking test/lib/python2.7/posixpath.pyo
  Symlinking test/lib/python2.7/locale.pyc
  Symlinking test/lib/python2.7/locale.pyo
  Symlinking test/lib/python2.7/codecs.pyc
  Symlinking test/lib/python2.7/ntpath.py
  Symlinking test/lib/python2.7/stat.py
Creating test/lib/python2.7/site-packages
Writing test/lib/python2.7/site.py
Writing test/lib/python2.7/orig-prefix.txt
Creating parent directories for test/include
Symlinking test/include/python2.7
Creating test/bin
New python executable in test/bin/python2.7
Changed mode of test/bin/python2.7 to 0755
Also creating executable in test/bin/python
Changed mode of test/bin/python to 0755
Testing executable with test/bin/python2.7 -c "import sys; print sys.prefix"
Traceback (most recent call last):
  File "/home/marek/projects/workspace/test/lib/python2.7/site.py", line 67, in <module>
    import os
  File "/home/marek/projects/workspace/test/lib/python2.7/os.py", line 49, in <module>
    import posixpath as path
  File "/home/marek/projects/workspace/test/lib/python2.7/posixpath.py", line 17, in <module>
    import warnings
ImportError: No module named warnings
ERROR: The executable test/bin/python2.7 is not functioning
ERROR: It thinks sys.prefix is '/home/marek/projects/workspace' (should be '/home/marek/projects/workspace/test')
ERROR: virtualenv is not compatible with this system or executable

文件warnings.py在/usr/local/lib/python2.7/。

用python2.6创建virtualenv没有问题。

Answer 1

所以我检查了 virtualenv.py 代码，它有一个 REQUIRED_MODULES 列表，它似乎有模块名称要附加到新环境的/lib 目录中。此列表在满足条件后由模块“警告”扩展:

sys.version_info[:2] >= (2, 6)

正确识别了python的版本，所以virtualenv.py没有问题。指定我使用的是已安装的 virtualenv，而不是文件 virtualenv.py。

从 python dist-packages 中删除文件 virtualenv.pyc 后，问题就消失了。所以看起来，编译的 virtualenv 文件有问题 - 看起来像 pythons 版本检查的问题。