Remove confusing instance variable example in cheat sheet #15441
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The mypy cheat sheet documentation provides an example on how to type instance and class attributes. However, it shows that an attribute with a default value in the class body is an instance variable, and I don't think this is correct. I understand that strings are immutable, which makes the example valid in the end, but I don't believe this is a great practice to define instance variables with a value outside of the init method.
Please let me know if you disagree or would prefer to change the comment rather than deleting the example.