我一直在尝试安装请求，但每次安装都会启动，然后会出现此错误。有什么方法可以绕过这个问题或修复这个错误，这样我就可以使用请求了吗？
Traceback (most recent call last):
File "C:Python27libsite-packagespipbasecommand.py", line 122, in main
status = self.run(options, args)
File "C:Python27libsite-packagespipcommandsinstall.py", line 278, in run
requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
File "C:Python27libsite-packagespipreq.py", line 1265, in prepare_files
req_to_install.extras):
File "C:Python27libsite-packagespip_vendorpkg_resources.py", line 2291, in requires
dm = self._dep_map
File "C:Python27libsite-packagespip_vendorpkg_resources.py", line 2484, in _dep_map
self.__dep_map = self._compute_dependencies()
File "C:Python27libsite-packagespip_vendorpkg_resources.py", line 2508, in _compute_dependencies
parsed = next(parse_requirements(distvers))
File "C:Python27libsite-packagespip_vendorpkg_resources.py", line 45, in <lambda>
next = lambda o: o.next()
File "C:Python27libsite-packagespip_vendorpkg_resources.py", line 2605, in parse_requirements
line, p, specs = scan_list(VERSION,LINE_END,line,p,(1,2),"version spec")
File "C:Python27libsite-packagespip_vendorpkg_resources.py", line 2573, in scan_list
raise ValueError("Expected "+item_name+" in",line,"at",line[p:])
ValueError: ('Expected version spec in', 'charset-normalizer ~=2.0.0', 'at', ' ~=2.0.0')
Storing debug log for failure in C:Usersl--lpippip.log
我已经正确地进入了文件，但我似乎无法获得下载请求。
重新安装pip
curl https://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py
python2.7 get-pip.py
安装请求
python2.7 -m pip install requests
或手动安装
git clone git://github.com/psf/requests.git
cd requests
python2.7 -m pip install .