guix/gnu/packages/patches/python-pep8-stdlib-tokenize-compat.patch

From 397463014fda3cdefe8d6c9d117ae16d878dc494 Mon Sep 17 00:00:00 2001
From: Michael Hudson-Doyle <michael.hudson@canonical.com>
Date: Tue, 25 Sep 2018 14:58:57 +1200
Subject: [PATCH] Keep compability with stdlib tokenize.py changes

https://github.com/python/cpython/commit/c4ef4896eac86a6759901c8546e26de4695a1389
is not yet part of any release of Python but has been backported to all
versions in Git (includeing 2.7!). It causes the tokenize.py module to
emit a synthetic NEWLINE token for files that do not in fact end with a
newline, which confuses pycodestyle's checks for blank lines at the end
of a file. Fortunately the synthetic NEWLINE tokens are easy to detect
(the token text is "").

Fixes #786
---
 pycodestyle.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pycodestyle.py b/pycodestyle.py
index 0d725d27..fbc3dca3 100755
--- a/pep8.py
+++ b/pep8.py
@@ -258,10 +258,10 @@ def trailing_blank_lines(physical_line, lines, line_number, total_lines):
     """
     if line_number == total_lines:
         stripped_last_line = physical_line.rstrip()
-        if not stripped_last_line:
+        if physical_line and not stripped_last_line:
             return 0, "W391 blank line at end of file"
         if stripped_last_line == physical_line:
-            return len(physical_line), "W292 no newline at end of file"
+            return len(lines[-1]), "W292 no newline at end of file"
 
 
 @register_check