How 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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