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(1) Actually, call by object reference would be a better description, since if a mutable object is passed, the caller will see any changes the callee makes to it (items inserted into a list). (2) The rules for comparing objects of different types should not be relied upon; they may change in a future version of the language. (3) In fact function definitions are also `statements' that are `executed'; the execution enters the function name in the module's global symbol table. (4)
Except for one thing. Module objects have a secret read-only attribute called (5)
Python will execute the contents of a file identified by the ‘PYTHONSTARTUP’ environment variable when you start an interactive interpreter.
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