python读取两层文件

import os
from common.readconfig import ReadConfig

class ReadCaseDate(object):
    """读取测试案例数据"""
    def readcasedate(self):
        allfilepath = []
        self.datadir = ReadConfig()  # 对ReadConfig类实例化(写的一个获取地址的类)
        testdatadir = self.datadir.get_testdatadir("testdatadir")  # 获取文件夹地址
        allfilenames = os.listdir(testdatadir)  # 获取地址下的有文件
        #print(allfilenames)
        #print(type(allfilenames))
        # 两层查找文件循环
        for filename in allfilenames:
            # print(filename)
            # print(type(filename))
            if (filename.endswith('.xls')) or (filename.endswith('.xlsx')):
                filepath = os.path.join(testdatadir, filename)
                allfilepath.append(filepath)
                #print(allfilepath)
            else:
                filesdir = os.path.join(testdatadir,filename)
                files = os.listdir(filesdir)
                for file in files:
                    if (file.endswith('.xls')) or (file.endswith('.xlsx')):
                        filepath = os.path.join(filesdir, file)
                        allfilepath.append(filepath)
                    else:
                        pass
        return allfilepath

if __name__ == '__main__':
    test = ReadCaseDate()
    i = test.readcasedate()
    print(i)