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Pythonでコードを書いていると、時々「え、ここで？」と思うような、予期せぬエラーに遭遇することがありますよね。その一つが TypeError: 'set' object is not callable です。関数を呼び出しているつもりなのに、「呼び出せません」と怒られてしまう、少し不思議 ...

This seems to happen when the callback is set to None or when self.callback() returns None, but the code does not check for this before calling it. Additionally, I noticed that even after the main ...