PYTHON : Why does print(t) error if t.__str__() returns a non-string, but not print(t.__str__())?

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PYTHON : Why does print(t) error if t.__str__() returns a non-string, but not print(t.__str__())?
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a error t.__str__() Why PYTHON non-string, does print(t.__str__())? but returns print(t) : not if




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