diff --git a/Doc/reference/simple_stmts.rst b/Doc/reference/simple_stmts.rst index 618664b23f0680..5e3ede69d1e5d7 100644 --- a/Doc/reference/simple_stmts.rst +++ b/Doc/reference/simple_stmts.rst @@ -406,9 +406,9 @@ The extended form, ``assert expression1, expression2``, is equivalent to :: These equivalences assume that :const:`__debug__` and :exc:`AssertionError` refer to the built-in variables with those names. In the current implementation, the -built-in variable :const:`__debug__` is ``True`` under normal circumstances, +built-in variable ``__debug__`` is ``True`` under normal circumstances, ``False`` when optimization is requested (command line option :option:`-O`). The current -code generator emits no code for an assert statement when optimization is +code generator emits no code for an :keyword:`assert` statement when optimization is requested at compile time. Note that it is unnecessary to include the source code for the expression that failed in the error message; it will be displayed as part of the stack trace. @@ -531,8 +531,8 @@ The :keyword:`!yield` statement yield_stmt: `yield_expression` A :keyword:`yield` statement is semantically equivalent to a :ref:`yield -expression `. The yield statement can be used to omit the parentheses -that would otherwise be required in the equivalent yield expression +expression `. The ``yield`` statement can be used to omit the +parentheses that would otherwise be required in the equivalent yield expression statement. For example, the yield statements :: yield @@ -544,7 +544,7 @@ are equivalent to the yield expression statements :: (yield from ) Yield expressions and statements are only used when defining a :term:`generator` -function, and are only used in the body of the generator function. Using yield +function, and are only used in the body of the generator function. Using :keyword:`yield` in a function definition is sufficient to cause that definition to create a generator function instead of a normal function. @@ -964,25 +964,14 @@ The :keyword:`!global` statement .. productionlist:: python-grammar global_stmt: "global" `identifier` ("," `identifier`)* -The :keyword:`global` statement is a declaration which holds for the entire -current code block. It means that the listed identifiers are to be interpreted -as globals. It would be impossible to assign to a global variable without +The :keyword:`global` statement causes the listed identifiers to be interpreted +as globals. It would be impossible to assign to a global variable without :keyword:`!global`, although free variables may refer to globals without being declared global. -Names listed in a :keyword:`global` statement must not be used in the same code -block textually preceding that :keyword:`!global` statement. - -Names listed in a :keyword:`global` statement must not be defined as formal -parameters, or as targets in :keyword:`with` statements or :keyword:`except` clauses, or in a :keyword:`for` target list, :keyword:`class` -definition, function definition, :keyword:`import` statement, or variable -annotation. - -.. impl-detail:: - - The current implementation does not enforce some of these restrictions, but - programs should not abuse this freedom, as future implementations may enforce - them or silently change the meaning of the program. +The :keyword:`global` statement applies to the entire scope of a function or +class body. A :exc:`SyntaxError` is raised if a variable is used or +assigned to prior to its global declaration in the scope. .. index:: pair: built-in function; exec @@ -1018,7 +1007,7 @@ identifiers. If a name is bound in more than one nonlocal scope, the nearest binding is used. If a name is not bound in any nonlocal scope, or if there is no nonlocal scope, a :exc:`SyntaxError` is raised. -The nonlocal statement applies to the entire scope of a function or +The :keyword:`nonlocal` statement applies to the entire scope of a function or class body. A :exc:`SyntaxError` is raised if a variable is used or assigned to prior to its nonlocal declaration in the scope.