5.2.1 Identifiers (Names)
An identifier occurring as an atom is a name. See Section 4.1 for documentation of
naming and binding.
When the name is bound to an object, evaluation of the atom yields that object. When a
name is not bound, an attempt to evaluate it raises a NameError
exception.
Private name mangling:
when an identifier that textually occurs in a class definition begins with two or more
underscore characters and does not end in two or more underscores, it is considered a private name of that class. Private names are transformed to a longer form
before code is generated for them. The transformation inserts the class name in front of
the name, with leading underscores removed, and a single underscore inserted in front of
the class name. For example, the identifier __spam occurring in a class named
Ham will be transformed to _Ham__spam. This transformation is
independent of the syntactical context in which the identifier is used. If the transformed
name is extremely long (longer than 255 characters), implementation defined truncation may
happen. If the class name consists only of underscores, no transformation is done.
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