From: Benjamin Peterson <benjamin@python.org>
Date: Sun, 4 May 2014 00:22:00 +0000 (-0400)
Subject: improve idioms (closes #20642)
X-Git-Tag: v3.5.0a1~1741
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=4ce5f3f203c1c510bd1eff4d8fffea6198e40b4d;p=thirdparty%2FPython%2Fcpython.git

improve idioms (closes #20642)

Patch by Claudiu Popa.
---

diff --git a/Lib/copy.py b/Lib/copy.py
index bb8840ed549a..383609bc648f 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -221,17 +221,15 @@ def _deepcopy_list(x, memo):
 d[list] = _deepcopy_list
 
 def _deepcopy_tuple(x, memo):
-    y = []
-    for a in x:
-        y.append(deepcopy(a, memo))
+    y = [deepcopy(a, memo) for a in x]
     # We're not going to put the tuple in the memo, but it's still important we
     # check for it, in case the tuple contains recursive mutable structures.
     try:
         return memo[id(x)]
     except KeyError:
         pass
-    for i in range(len(x)):
-        if x[i] is not y[i]:
+    for k, j in zip(x, y):
+        if k is not j:
             y = tuple(y)
             break
     else: