capybara/virtualenv/lib/python2.7/site-packages/setuptools/dist.py
def check_requirements(dist, attr, value):
    """Verify that install_requires is a valid requirements list"""
    try:
        list(pkg_resources.parse_requirements(value))
    except (TypeError, ValueError) as error:
        tmpl = (
            "{attr!r} must be a string or list of strings "
            "containing valid project/version requirement specifiers; {error}"
        )
        raise DistutilsSetupError(tmpl.format(attr=attr, error=error))
def check_requirements(dist, attr, value):
    """Verify that install_requires is a valid requirements list"""
    try:
        list(pkg_resources.parse_requirements(value))
    except (TypeError, ValueError) as error:
        tmpl = (
            "{attr!r} must be a string or list of strings "
            "containing valid project/version requirement specifiers; {error}"
        )
        raise DistutilsSetupError(tmpl.format(attr=attr, error=error))
Verify that install_requires is a valid requirements list