dist.py 文件源码

 复制代码def _check_extra(extra, reqs):
    name, sep, marker = extra.partition(':')
    if marker and pkg_resources.invalid_marker(marker):
        raise DistutilsSetupError("Invalid environment marker: " + marker)

    # extras requirements cannot themselves have markers
    parsed = pkg_resources.parse_requirements(reqs)
    marked_reqs = filter(operator.attrgetter('marker'), parsed)
    bad_req = next(marked_reqs, None)
    if bad_req:
        tmpl = (
            "'extras_require' requirements cannot include "
            "environment markers, in {name!r}: '{bad_req!s}'"
        )
        raise DistutilsSetupError(tmpl.format(**locals()))