1 files changed, 4 insertions, 4 deletions
diff --git a/test/Climb/explicit-parent--U.py b/test/Climb/explicit-parent--U.py
index ab2d33e..5308632 100644
--- a/test/Climb/explicit-parent--U.py
+++ b/test/Climb/explicit-parent--U.py
@@ -38,10 +38,10 @@ test.subdir('subdir')
 test.write('SConstruct', """\
 def cat(env, source, target):
     target = str(target[0])
-    f = open(target, "wb")
-    for src in source:
-        f.write(open(str(src), "rb").read())
-    f.close()
+    with open(target, 'wb') as ofp:
+        for src in source:
+            with open(str(src), 'rb') as ifp:
+                ofp.write(ifp.read())
 env = Environment(BUILDERS={'Cat':Builder(action=cat)})
 env.Cat('foo.out', 'foo.in')
 SConscript('subdir/SConscript', "env")