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 : //opt/imunify360/venv/lib64/python3.11/site-packages/defence360agent/utils/importer.py
"""
Provides utilities for dynamically loading packages/modules.
"""
import importlib
import importlib.util
import logging
import os
import pkgutil
import sys
from pathlib import Path
from typing import Generator, List, Union

logger = logging.getLogger(__name__)


def get_module_by_path(
    module_name: str, file_path: Union[str, Path]
) -> "module":
    """
    Execute and return module from *file_path*
    """
    # https://docs.python.org/3/library/importlib.html#importing-a-source-file-directly
    spec = importlib.util.spec_from_file_location(module_name, file_path)
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


def iter_modules(
    paths: List[Union[str, Path]]
) -> Generator["module", None, None]:
    """
    Yields all modules from *paths*
    """
    for module in pkgutil.iter_modules(paths):
        if not module.ispkg:
            path = Path(module.module_finder.path) / f"{module.name}.py"
            yield get_module_by_path(module.name, path)


def load(name: str, missing_ok=False) -> None:
    """
    Import *name* module, if *name* is a package import all submodules.
    If *name* module/package is not found:
     - raise ModuleNotFoundError if *missing_ok* is False
     - ignore it if *missing_ok* is True
    """
    try:
        spec = importlib.util.find_spec(name)
    except ModuleNotFoundError:
        if not missing_ok:
            raise
        return
    # import *name* itself, for package it is __init__.py
    importlib.import_module(name)
    if spec.loader.is_package(spec.name):
        package = name
        for module in pkgutil.iter_modules(spec.submodule_search_locations):
            importlib.import_module(f"{package}.{module.name}")


def load_packages(packages: tuple, missing_ok=False) -> None:
    for package in packages:
        load(package, missing_ok=missing_ok)


def get(*, module, name, default):
    """
    Return object with *name* from specific *module*.
    If object was not found return *default*
    """
    try:
        m = importlib.import_module(module)
    except ModuleNotFoundError:
        return default
    return getattr(m, name, default)


def exists(name):
    try:
        spec = importlib.util.find_spec(name)
    except ModuleNotFoundError:
        return False
    return spec is not None

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