[Python-checkins] bpo-32625: Updated documentation for EXTENDED_ARG. (GH-13985)

Miss Islington (bot) webhook-mailer at python.org
Tue Jun 11 23:51:46 EDT 2019


https://github.com/python/cpython/commit/f0cc1a91f72c7f60adc47ec9a4305d8d85dcb1f2
commit: f0cc1a91f72c7f60adc47ec9a4305d8d85dcb1f2
branch: 3.7
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: GitHub <noreply at github.com>
date: 2019-06-11T20:51:42-07:00
summary:

bpo-32625: Updated documentation for EXTENDED_ARG. (GH-13985)


Python 3.6 changed the size of bytecode instruction, while the documentation for `EXTENDED_ARG` was not updated accordingly.
(cherry picked from commit 405f648db7c44b07348582b5101d4716e0ce5ac3)

Co-authored-by: Yao Zuo <laike9m at users.noreply.github.com>

files:
M Doc/library/dis.rst

diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst
index b8cf4463d935..5e6f002dcd76 100644
--- a/Doc/library/dis.rst
+++ b/Doc/library/dis.rst
@@ -1165,10 +1165,10 @@ All of the following opcodes use their arguments.
 
 .. opcode:: EXTENDED_ARG (ext)
 
-   Prefixes any opcode which has an argument too big to fit into the default two
-   bytes.  *ext* holds two additional bytes which, taken together with the
-   subsequent opcode's argument, comprise a four-byte argument, *ext* being the
-   two most-significant bytes.
+   Prefixes any opcode which has an argument too big to fit into the default one
+   byte. *ext* holds an additional byte which act as higher bits in the argument.
+   For each opcode, at most three prefixal ``EXTENDED_ARG`` are allowed, forming
+   an argument from two-byte to four-byte.
 
 
 .. opcode:: FORMAT_VALUE (flags)



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