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SF #829941, update tutorial, built-in types can be base classes since 2.2
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@ -3550,8 +3550,8 @@ method function is declared with an explicit first argument
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representing the object, which is provided implicitly by the call. As
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in Smalltalk, classes themselves are objects, albeit in the wider
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sense of the word: in Python, all data types are objects. This
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provides semantics for importing and renaming. But, just like in
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\Cpp{} or Modula-3, built-in types cannot be used as base classes for
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provides semantics for importing and renaming. Unlike
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\Cpp{} and Modula-3, built-in types can be used as base classes for
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extension by the user. Also, like in \Cpp{} but unlike in Modula-3, most
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built-in operators with special syntax (arithmetic operators,
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subscripting etc.) can be redefined for class instances.
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