python 将print输出的内容保存到txt文件中

import sys
import os
class Logger(object):
  def __init__(self, filename="Default.log"):
    self.terminal = sys.stdout
    self.log = open(filename, "a")
  def write(self, message):
    self.terminal.write(message)
    self.log.write(message)
  def flush(self):
    pass
path = os.path.abspath(os.path.dirname(__file__))
type = sys.getfilesystemencoding()
sys.stdout = Logger('a.txt')
print(path)
print(os.path.dirname(__file__))
print('------------------')