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"Private" instance variables that cannot be accessed except from inside an
-object, don't exist in Python. However, there is a convention that is followed
+object don't exist in Python. However, there is a convention that is followed
by most Python code: a name prefixed with an underscore (e.g. ``_spam``) should
be treated as a non-public part of the API (whether it is a function, a method
or a data member). It should be considered an implementation detail and subject