Fix bugs without breaking down existing code

Elvis elvismoodbidri at
Sun Apr 25 12:02:39 CEST 2010

Say, a Standard Library function works in a way it was not supposed

Developers (who use Python) handle this issue themselves.
And then, you (a python-core developer) fix the behavior of the

Although you have “fixed” the bug, anyone who upgrades, will be in
Their code may no longer work.

How do you go about this issue?
How do you fix things without breaking down existing systems?

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