Footnotes

...^2.1^2.1: A problem with the GNU Readline package may prevent this.
...^3.1^3.1: I'd prefer to use different fonts to distinguish input from output, but the amount of LaTeX hacking that would require is currently beyond my ability.
... value.^4.1^4.1: 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 (e.g., items inserted into a list).
...^5.1^5.1: The rules for comparing objects of different types should not be relied upon; they may change in a future version of the language.
...^6.1^6.1: In fact function definitions are also `statements' that are `executed'; the execution enters the function name in the module's global symbol table.
...^9.1^9.1: Except for one thing. Module objects have a secret read-only attribute called __dict__ which returns the dictionary used to implement the module's name space; the name __dict__ is an attribute but not a global name. Obviously, using this violates the abstraction of name space implementation, and should be restricted to things like post-mortem debuggers...