From 9a14d41f224ae1d54a210c81d74a890ff258ec2b Mon Sep 17 00:00:00 2001 From: sweeneyde Date: Sat, 4 Jun 2022 15:24:25 -0400 Subject: [PATCH] Document LOAD_FAST_CHECK opcode --- Doc/library/dis.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst index 313870ffa4de6a..9163d1a4421a8c 100644 --- a/Doc/library/dis.rst +++ b/Doc/library/dis.rst @@ -1042,6 +1042,17 @@ iterations of the loop. Pushes a reference to the local ``co_varnames[var_num]`` onto the stack. + .. versionchanged:: 3.12 + This opcode is now only used in situations where the local variable is + guaranteed to be initialized. It cannot raise :exc:`UnboundLocalError`. + +.. opcode:: LOAD_FAST_CHECK (var_num) + + Pushes a reference to the local ``co_varnames[var_num]`` onto the stack, + raising an :exc:`UnboundLocalError` if the local variable has not been + initialized. + + .. versionadded:: 3.12 .. opcode:: STORE_FAST (var_num)