This bug also seems to makes it impossible to update pip to a specific
version using `pip install --upgrade pip==<version>` or `pip install
<pip-package-url>` or `pip install <pip-package-file>`.
E.g:
```
# pip install pip-8.1.2-py2.py3-none-any.whl
Exception:
Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 209, in main
status = self.run(options, args)
File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 328, in
run
wb.build(autobuilding=True)
File "/usr/lib/python2.7/dist-packages/pip/wheel.py", line 748, in build
self.requirement_set.prepare_files(self.finder)
File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 360, in
prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 448, in
_prepare_file
req_to_install, finder)
File "/usr/lib/python2.7/dist-packages/pip/req/req_set.py", line 387, in
_check_skip_installed
req_to_install.check_if_exists()
File "/usr/lib/python2.7/dist-packages/pip/req/req_install.py", line 1011, in
check_if_exists
self.req.project_name
AttributeError: 'Requirement' object has no attribute 'project_name'
You are using pip version 8.1.1, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
```
Only `pip install --upgrade pip` (with no version constraint) works as
expected.
For deploys on machines which don't have internet access (and thus can't
access PyPI directly) this problem is very inconvenient.
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https://bugs.launchpad.net/bugs/1586381
Title:
Pip states report "AttributeError: 'Requirement' object has no
attribute 'project_name'" since python-pip (8.1.1-2ubuntu0.1)
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