关于在虚拟环境中使用pip安装时，Command "python setup.py egg_info" failed with error code 1报错，解决办法之一
在虚拟环境中安装drf-haystack时，pip报错
Collecting drf-haystack
Downloading https://files.pythonhosted.org/packages/58/77/6be5100aaf2277157b4e3b4c7d9c4b570ddce82357974382bd1b92ccef16/drf_haystack-1.8.3-py2.py3-none-any.whl
Requirement already satisfied: djangorestframework>=3.7 in ./test/meiduo_04/lib/python3.5/site-packages (from drf-haystack) (3.8.2)
Collecting django-haystack>=2.8 (from drf-haystack)
Downloading https://files.pythonhosted.org/packages/69/43/3e247b7b2134b48e9a53fb387e191e5e05b5f38f2faf78ca892097c2b441/django-haystack-2.8.1.tar.gz (1.6MB)
100% |████████████████████████████████| 3.1MB 46kB/s
Complete output from command python setup.py egg_info:
Download error on https://pypi.org/simple/setuptools_scm/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645) -- Some packages may not be found!
Download error on https://pypi.org/simple/setuptools-scm/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645) -- Some packages may not be found!
Couldn't find index page for 'setuptools_scm' (maybe misspelled?)
Download error on https://pypi.org/simple/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645) -- Some packages may not be found!
No local packages or working download links found for setuptools_scm
Traceback (most recent call last):
File "
File "/private/tmp/pip-install-seee4ha0/django-haystack/setup.py", line 71, in
setup_requires=['setuptools_scm'],
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/setuptools/__init__.py", line 130, in setup
_install_setup_requires(attrs)
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/setuptools/__init__.py", line 125, in _install_setup_requires
dist.fetch_build_eggs(dist.setup_requires)
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/setuptools/dist.py", line 514, in fetch_build_eggs
replace_conflicting=True,
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/pkg_resources/__init__.py", line 773, in resolve
replace_conflicting=replace_conflicting
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/pkg_resources/__init__.py", line 1056, in best_match
return self.obtain(req, installer)
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/pkg_resources/__init__.py", line 1068, in obtain
return installer(requirement)
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/setuptools/dist.py", line 581, in fetch_build_egg
return cmd.easy_install(req)
File "/Users/anti/test/meiduo_04/lib/python3.5/site-packages/setuptools/command/easy_install.py", line 670, in easy_install
raise DistutilsError(msg)
distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('setuptools_scm')
----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/tmp/pip-install-seee4ha0/django-haystack/
报出错误为下载工具中文件缺失问题，
Download error on https://pypi.org/simple/setuptools-scm/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:645) -- Some packages may not be found!
No local packages or working download links found for setuptools_scm
故通过https://pypi.org/simple/setuptools-scm/下载补丁setuptools_scm-3.0.6-py2.py3-none-any.whl进行解决。
通过pip install setuptools_scm-3.0.6-py2.py3-none-any.whl
后进行sudo pip install drf-haystack解决