Fix deployment again

[chadwhitacre]

The build is failing at Heroku. What's up?

[chadwhitacre]

-----> Python app detected
     $ pip install -r requirements.txt
       Obtaining file:///tmp/build_43624b206fad8e5a633cc1acbe71d3e7 (from -r /tmp/build_43624b206fad8e5a633cc1acbe71d3e7/requirements.txt (line 22))
       Installing collected packages: inside-gratipay
         Found existing installation: inside-gratipay 0.0.0
       Exception:
       Traceback (most recent call last):
         File "/app/.heroku/python/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg/pip/basecommand.py", line 215, in main
           status = self.run(options, args)
         File "/app/.heroku/python/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg/pip/commands/install.py", line 342, in run
           prefix=options.prefix_path,
         File "/app/.heroku/python/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_set.py", line 778, in install
           requirement.uninstall(auto_confirm=True)
         File "/app/.heroku/python/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 703, in uninstall
           '(at %s)' % (link_pointer, self.name, dist.location)
       AssertionError: Egg-link /app does not match installed location of inside-gratipay (at /tmp/build_43624b206fad8e5a633cc1acbe71d3e7)
 !     Push rejected, failed to compile Python app.
 !     Push failed

[chadwhitacre]

pypa/pip#3784
pypa/pip#640

[chadwhitacre]

@kennethreitz Is it perhaps obvious to you what is going on here?

[kennethreitz]

This may be a bug on our end. I will be investigating tomorrow. @whit537 want to hop on a call with me?

[kennethreitz]

I believe I fixed this issue today. I hate to ask this, but can you try again now?

[kennethreitz]

or was that deploy from 3 hours ago?

[chadwhitacre]

Just got off the phone w/ @kennethreitz ... we are back on track! Thanks, Kenneth! 💃 🙇

The issue was heroku/heroku-buildpack-python#347. @kennethreitz helped purge our build cache and then another push and we were set. 👍