#coding:utf-8
import os
 
#dirName：上级目录名称
#sysCoding：系统编码格式
#targetCoding：转换目标编码格式
def get_dir_realpath(dirName,sysCoding,targetCoding):
  path = os.path.split(os.path.realpath(__file__))[0].decode(sysCoding).encode(targetCoding)
  dirList = path.split("\\")
  length = len(dirList)
  for _ in range(1,length):
    fileName = os.path.split(path)[1]
    path = os.path.split(path)[0]
    if fileName == dirName:
      return path
      break
  return ""
    
print get_dir_realpath("我的file",'cp936',"utf-8") 执行结果：E:\learn\python