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NameError: global name 'FileNotFoundError' is not defined

See original GitHub issue

Pip version: Current master, dd3defe509d6103605d8da8270a4787f0e8ec616
Python version: 2.7

Description:

Some pip installs on 2.7 are failing with NameError: global name 'FileNotFoundError' is not defined. The full stack trace is

Traceback (most recent call last):
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/commands/install.py", line 332, in run
    wb.build(autobuilding=True)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/wheel.py", line 716, in build
    self.requirement_set.prepare_files(self.finder)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/req/req_set.py", line 381, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/req/req_set.py", line 488, in _prepare_file
    req_to_install, finder)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/req/req_set.py", line 429, in _check_skip_installed
    req_to_install, upgrade_allowed)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/index.py", line 465, in find_requirement
    all_candidates = self.find_all_candidates(req.name)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/index.py", line 423, in find_all_candidates
    for page in self._get_pages(url_locations, project_name):
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/index.py", line 568, in _get_pages
    page = self._get_page(location)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/index.py", line 683, in _get_page
    return HTMLPage.get_page(link, session=self.session)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/index.py", line 792, in get_page
    "Cache-Control": "max-age=600",
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 488, in get
    return self.request('GET', url, **kwargs)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/download.py", line 386, in request
    return super(PipSession, self).request(method, url, *args, **kwargs)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 475, in request
    resp = self.send(prep, **send_kwargs)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/_vendor/requests/sessions.py", line 596, in send
    r = adapter.send(request, **kwargs)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/_vendor/cachecontrol/adapter.py", line 37, in send
    cached_response = self.controller.cached_request(request)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/_vendor/cachecontrol/controller.py", line 202, in cached_request
    self.cache.delete(cache_url)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/download.py", line 302, in delete
    return super(SafeFileCache, self).delete(*args, **kwargs)
  File "/opt/virtualenvs/proj/lib/python2.7/site-packages/pip/_vendor/cachecontrol/caches/file_cache.py", line 117, in delete
    except FileNotFoundError:
NameError: global name 'FileNotFoundError' is not defined