$ pip install clearbit                                                                      
Collecting clearbit                                                                                                                                             Downloading clearbit-0.1.7.tar.gz (5.0 kB)       
    ERROR: Command errored out with exit status 1:                                                                                                            
     command: /var/virtualenv/py37/bin/python -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-1neb7o7s/clearbit_9b2
c9bb86a3047dabc1f8b18e18ae25a/setup.py'"'"'; __file__='"'"'/tmp/pip-install-1neb7o7s/clearbit_9b2c9bb86a3047dabc1f8b18e18ae25a/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-8vb5blw9                                 cwd: /tmp/pip-install-1neb7o7s/clearbit_9b2c9bb86a3047dabc1f8b18e18ae25a/                                                                            
    Complete output (1 lines):                                                                                                                                
    error in clearbit setup command: use_2to3 is invalid.                                                                                                     
    ----------------------------------------                                                                                                                  
WARNING: Discarding https://files.pythonhosted.org/packages/50/e7/bbd7c4525cb4ecb74fbe7f4dff6f4112342d9050d64b3be8d56b8c0a028b/clearbit-0.1.7.tar.gz#sha256=f1
d5b854a9b0e8d6644bad2594f9e65ab756ffb0c6c34db15ecfc1e9179bb883 (from https://pypi.org/simple/clearbit/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.