Suporte ao python3 via pip install

[berinhard]

Estou tendo o seguinte erro quando tento instalar em um ambiente python3:

$ pip install oxente
Collecting oxente
  Downloading https://files.pythonhosted.org/packages/ca/e9/b3686b8e294ba991835e660050378b1c6e3d3e9269228120ecddf86aa564/oxente-1.0.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-cm3_xqzv/oxente/setup.py", line 7, in <module>
        long_description = file('README.rst').read()
    NameError: name 'file' is not defined
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-cm3_xqzv/oxente/
You are using pip version 19.0.3, however version 19.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.