check_requirements.py 文件源码

def parse_requirement(req):
    dumb_parse = pkg_resources.Requirement.parse(req)
    if dumb_parse.extras:
        extras = '[{}]'.format(','.join(dumb_parse.extras))
    else:
        extras = ''
    return pkg_resources.Requirement.parse(
        dumb_parse.project_name + extras + ','.join(
            operator + pkg_resources.safe_version(version)
            for operator, version in dumb_parse.specs
        )
    )