on line 4 of setup .py there is this code
from pip.req import parse_requirements

pip internals should not be used this way and this fails with latest pip

do
pip install --upgrade pip
pip install zip

upgrading pip to latest
Collecting pip
Downloading https://files.pythonhosted.org/packages/5f/25/e52d3f31441505a5f3af41213346e5b6c221c9e086a166f3703d2ddaf940/pip-18.0-py2.py3-none-any.whl (1.3MB)
100% |████████████████████████████████| 1.3MB 6.0MB/s
Installing collected packages: pip
Found existing installation: pip 10.0.1
Uninstalling pip-10.0.1:
Successfully uninstalled pip-10.0.1
Successfully installed pip-18.0
.......
Downloading https://files.pythonhosted.org/packages/b1/e7/212bf1ce8d65b357c337da56934922d18c3845127e8a188182266157c663/zip-0.0.1.tar.gz
Complete output from command python setup.py egg_info:
Traceback (most recent call last):
File "", line 1, in
File "/tmp/pip-install-d99V2P/zip/setup.py", line 4, in
from pip.req import parse_requirements
ImportError: No module named req

If you run on Ubuntu 18.0.4 the zip library will fail to install. The reason behind this is one of your requirements, being wsgiref.
As noted in https://pypi.org/project/wsgiref/#description the wsgiref only works for Python versions lower than or equal to 3.2, causing this library being uninstallable on P3.3 or higher. Traceback coming from the wsgiref library:

Collecting wsgiref>=0.1.2 (from zip==0.0.2)
  Downloading https://files.pythonhosted.org/packages/41/9e/309259ce8dff8c596e8c26df86dbc4e848b9249fd36797fd60be456f03fc/wsgiref-0.1.2.zip
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-7a12gwy0/wsgiref/setup.py", line 5, in <module>
        import ez_setup
      File "/tmp/pip-install-7a12gwy0/wsgiref/ez_setup/__init__.py", line 170
        print "Setuptools version",version,"or greater has been installed."
                                 ^
    SyntaxError: Missing parentheses in call to 'print'. Did you mean print("Setuptools version",version,"or greater has been installed.")?
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-7a12gwy0/wsgiref/

Is there a change to remove this library?