Python. Limitation of input data

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Not a programmer, I mess around with Python just4fun. There was a question raw_input — is it possible to forcibly limit the amount of input data? Tried to Google the answer if I googled wrong, or common there is no solution, or no one needs, because Python has a built-in automatic protection against the fool and can not bother.
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For example, s = sys.stdin.read(10) write in's only 10 bytes.
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I think you can play with the parameters of the readline
or use curses
or high-level wrapper over it — urwid
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Validate after input, no?
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Yes, but if the user has entered stabization characters?
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