[issue7867] Proposed FAQ entry on pass-by-? semantics and the meaning of 'variable' in python

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

The difference is that mutable objects may give the illusion of a pass-by-reference (because changes made inside the function are visible outside) whereas immutable objects give the illusion of pass-by-value (because you can't affect the original object in any way). This is also related to the confusion about assignment and what it really does.

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<http://bugs.python.org/issue7867>
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