我正在尝试使用此命令$ pip install pymssql在我的cygwin环境中安装python pymssql模块，我收到此错误：
Collecting pymssql
Using cached pymssql-2.1.2.tar.gz
Complete output from command python setup.py egg_info:
Download error on https://pypi.python.org/simple/setuptools_git/: unknown error (_ssl.c:2738) -- Some packages may not be found!
Download error on https://pypi.python.org/simple/setuptools-git/: unknown error (_ssl.c:2738) -- Some packages may not be found!
Couldn't find index page for 'setuptools_git' (maybe misspelled?)
Download error on https://pypi.python.org/simple/: unknown error (_ssl.c:2738) -- Some packages may not be found!
No local packages or download links found for setuptools-git
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/tmp/pip-build-epkoy3e7/pymssql/setup.py", line 464, in <module>
ext_modules = ext_modules(),
File "/usr/lib/python3.4/distutils/core.py", line 108, in setup
_setup_distribution = dist = klass(attrs)
File "/usr/lib/python3.4/site-packages/setuptools/dist.py", line 265, in __init__
self.fetch_build_eggs(attrs['setup_requires'])
File "/usr/lib/python3.4/site-packages/setuptools/dist.py", line 310, in fetch_build_eggs
replace_conflicting=True,
File "/usr/lib/python3.4/site-packages/pkg_resources/__init__.py", line 830, in resolve
dist = best[req.key] = env.best_match(req, ws, installer)
File "/usr/lib/python3.4/site-packages/pkg_resources/__init__.py", line 1075, in best_match
return self.obtain(req, installer)
File "/usr/lib/python3.4/site-packages/pkg_resources/__init__.py", line 1087, in obtain
return installer(requirement)
File "/usr/lib/python3.4/site-packages/setuptools/dist.py", line 377, in fetch_build_egg
return cmd.easy_install(req)
File "/usr/lib/python3.4/site-packages/setuptools/command/easy_install.py", line 623, in easy_install
raise DistutilsError(msg)
distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('setuptools-git')
setup.py: platform.system() => 'CYGWIN_NT-6.1'
setup.py: platform.architecture() => ('64bit', '')
setup.py: platform.libc_ver() => ('', '')
setup.py: Not using bundled FreeTDS
setup.py: include_dirs = []
setup.py: library_dirs = ['/usr/local/lib']
我已将pip更新为8.1.1，将openssl更新为1.0.2g。我对任何python模块都有同样的问题，而不仅仅是pymssql。