晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/lib/python3.6/site-packages/pip/operations/check.py

def check_requirements(installed_dists):
    missing_reqs_dict = {}
    incompatible_reqs_dict = {}

    for dist in installed_dists:
        key = '%s==%s' % (dist.project_name, dist.version)

        missing_reqs = list(get_missing_reqs(dist, installed_dists))
        if missing_reqs:
            missing_reqs_dict[key] = missing_reqs

        incompatible_reqs = list(get_incompatible_reqs(
            dist, installed_dists))
        if incompatible_reqs:
            incompatible_reqs_dict[key] = incompatible_reqs

    return (missing_reqs_dict, incompatible_reqs_dict)


def get_missing_reqs(dist, installed_dists):
    """Return all of the requirements of `dist` that aren't present in
    `installed_dists`.

    """
    installed_names = set(d.project_name.lower() for d in installed_dists)
    missing_requirements = set()

    for requirement in dist.requires():
        if requirement.project_name.lower() not in installed_names:
            missing_requirements.add(requirement)
            yield requirement


def get_incompatible_reqs(dist, installed_dists):
    """Return all of the requirements of `dist` that are present in
    `installed_dists`, but have incompatible versions.

    """
    installed_dists_by_name = {}
    for installed_dist in installed_dists:
        installed_dists_by_name[installed_dist.project_name] = installed_dist

    for requirement in dist.requires():
        present_dist = installed_dists_by_name.get(requirement.project_name)

        if present_dist and present_dist not in requirement:
            yield (requirement, present_dist)

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