E           CalledProcessError: Command: ('/home/travis/build/pre-commit/pre-commit/.tox/py27/bin/python2.7', '-m', 'virtualenv', '/tmp/pytest-of-travis/pytest-0/test_arbitrary_bytes_hook0/0/repoXLdwhd/py_env-python3.5', '-p', 'python3.5')
E           Return code: 127
E           Expected return code: 0
E           Output: 
E               Running virtualenv with interpreter /opt/pyenv/shims/python3.5
E               
E           Errors: 
E               pyenv: python3.5: command not found
E               
E               The `python3.5' command exists in these Python versions:
E                 3.5
E                 3.5.3