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import time
x
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 class Record:
 def __init__(self, initval=None, name=None):
 self.val = initval
 self.name = name
 self.filename = "record.txt"
 
 def __get__(self, instance, owner):
 with open(self.filename, 'a', encoding='utf-8') as f:
 f.write("%s 变量于北京时间 %s 被读取,%s = %s\n" % \
 (self.name, time.ctime(), self.name, str(self.val)))
 return self.val
 
 def __set__(self, instance, value):
 filename = "%s_record.txt" % self.name
 with open(self.filename, 'a', encoding='utf-8') as f:
 f.write("%s 变量于北京时间 %s 被修改, %s = %s\n" % \
 (self.name, time.ctime(), self.name, str(value)))
 self.val = value
 
 问题:标红的部分是什么作用,感谢回答
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