递归获取文件夹中所有的文件路径，

import os
lis=os.listdir('../user')
def fun(path):
    lis = os.listdir(path)
    lis2=[]
    for i in lis:
        full_path = os.path.join(path,i)
        if os.path.isdir(full_path):
            lis2.extend(fun(full_path))
        else:
            lis2.append(full_path)
    return lis2