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HomeBackend DevelopmentPython TutorialHow to implement automatic import of packages in python

问题描述: 代码编写过程中,需要引入文件,但是引入的文件随着项目的变大会变多,所以编写了一个自动导入的方法,会根据文件名称的特点进行导入。

def auto_import(packagePath: str, fileTag: str, interceptLength: int, level=1):
    """
    自动导入函数,导入具有某个标识的文件
    :param packagePath: 当前包路径
    :param level: 软件包层级
    :param fileTag:文件名称标识
    :param interceptLength:导入属性截取名称
    :return:
    """
    # 定义导入属性列表和包
    att_list = []
    # 获取对应的包层级
    rank = level
    package = ''
    for i in range(level):
        # 获取父级包名称拼接包名称
        package += packagePath.split('\\')[-rank] + '.'
        rank -= 1
    # 遍历当前包下的所有文件
    for fileName in os.listdir(packagePath):
        # 筛选出nameTag的文件进行导入
        if fileTag in fileName:
            print(f'导入包名称:{package}' + fileName[:-3])
            # 动态导入包,并获取包内的具体模块、属性
            att_list.append(
                # 导入包中的某个属性
                importlib.import_module(
                    # 拼接模块路径
                    f'{package}' + fileName[:-3]
                    # 获取模块中的对应属性
                ).__dict__[fileName[:-interceptLength]])
    # 返回属性列表
    return att_list

假如我们创建了多个TableModel文件,需要校验对应的文件是否在数据库中存在,那么我们就可以这么用:

import os
import auto_import


def auto_check_model():
    """
    导入tableModel中的所有文件,验证数据库中表是否存在
    :return: 返回验证结果
    """
    # 获取当前文件夹路径
    packagePath = os.path.dirname(os.path.realpath(__file__))
    # 获取所有model文件
    model_list = auto_import(packagePath=packagePath, fileTag='Model',  interceptLength=8, level=2)
    # 建立数据库连接
    connect = DatabaseOperation().connect()
    # 检查model在数据库中是否存在,不存在则创建
    for i in range(len(model_list)):
        model_list[i].metadata.create_all(connect)
        print(f"####     {model_list[i].__name__}校验完成!    ####")

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