From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 30 Mar 2019 05:38:14 +0000 (-0700)
Subject: bpo-17110: doc: add note how to get bytes from sys.argv (GH-12602)
X-Git-Tag: v3.7.4rc1~278
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=5b80cb5584a72044424f2d82d0ae79c720f24c47;p=thirdparty%2FPython%2Fcpython.git

bpo-17110: doc: add note how to get bytes from sys.argv (GH-12602)

(cherry picked from commit 38f4e468d4b55551e135c67337c18ae142193ba8)

Co-authored-by: Inada Naoki <songofacandy@gmail.com>
---

diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index ace0e2808b18..c2c653e00beb 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -30,6 +30,12 @@ always available.
    To loop over the standard input, or the list of files given on the
    command line, see the :mod:`fileinput` module.
 
+   .. note::
+      On Unix, command line arguments are passed by bytes from OS.  Python decodes
+      them with filesystem encoding and "surrogateescape" error handler.
+      When you need original bytes, you can get it by
+      ``[os.fsencode(arg) for arg in sys.argv]``.
+
 
 .. data:: base_exec_prefix