return_stmt: "return" [expression_list]
return may only occur syntactically nested in a function definition, not within a nested class definition.
If an expression list is present, it is evaluated, else None
is substituted.
return leaves the current function call with the expression
list (or None
) as return value.
When return passes control out of a try statement with a finally clause, that finally clause is executed before really leaving the function.