python module import problem

import sys, os

print(__file__)    #当前.py文件的位置
print(os.path.abspath(__file__))  #返回当前.py文件的绝对路径
print(os.path.dirname(os.path.abspath(__file__)))   #当前文件的绝对路径目录，不包括当前 *.py 部分，即只到该文件目录
print(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))) #返回文件本身目录的上层目录    
print(os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__)))))  #每多一层，即再上一层目录

print(os.path.realpath(__file__))   #当前文件的真实地址
print(os.path.dirname(os.path.realpath(__file__))) # 当前文件夹的路径

path = os.path.dirname(os.path.abspath(__file__))
sys.path.append(path)   #将目录或路径加入搜索路径

print(__name__)

Recently, there is always an error that the module cannot be found. Even if the absolute path is used, it still does not work. It may be that the path is written incorrectly. Just add the upper path instead. It depends on the file structure.

import sys,os
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))