From a8d85057026bc070b2f73b57133f1910218ad815 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Wed, 9 Dec 2015 03:20:12 -0500
Subject: Use a defaultdict and count to track seen items

---
 setuptools/command/build_py.py | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'setuptools/command/build_py.py')

diff --git a/setuptools/command/build_py.py b/setuptools/command/build_py.py
index 55aed230..317dbba4 100644
--- a/setuptools/command/build_py.py
+++ b/setuptools/command/build_py.py
@@ -7,6 +7,8 @@ import fnmatch
 import textwrap
 import io
 import distutils.errors
+import collections
+import itertools
 
 
 try:
@@ -195,14 +197,13 @@ class build_py(orig.build_py, Mixin2to3):
                 os.path.join(src_dir, convert_path(pattern)),
             )
         )
-        seen = {}
+        seen = collections.defaultdict(itertools.count)
         return [
             fn
             for fn in files
             if fn not in bad
             # ditch dupes
-            and fn not in seen
-            and seen.setdefault(fn, 1)
+            and not next(seen[fn])
         ]
 
 
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