从__init__获取文件名

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只是试图获取要从init传递的文件名，这样我就不必在插入函数的参数中放入例如“ file.txt”。

class Simpledb():
      def __init__(self, filename):
          self.filename = filename

      def insert(self, key, value): 
          f = open(self.filename, 'a+')
          f.write(key + '\t' + value + '\n')
          f.close()

When used from another module with code from database2 import * and then Simpledb.insert('database.txt', name, number)(name and number are input strings), returns "AttributeError: 'str' object has no attribute 'filename'". How can I insert successfully?