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

[Serhiy Storchaka]

https://github.com/python/cpython/commit/405f648db7c44b07348582b5101d4716e0ce5ac3
commit: 405f648db7c44b07348582b5101d4716e0ce5ac3
branch: master
author: Yao Zuo <laike9m at users.noreply.github.com>
committer: Serhiy Storchaka <storchaka at gmail.com>
date: 2019-06-12T06:46:09+03:00
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.

files:
M Doc/library/dis.rst

diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst
index 2a3ffb5e8271..5b79be626626 100644
--- a/Doc/library/dis.rst
+++ b/Doc/library/dis.rst
@@ -1219,10 +1219,10 @@ 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)