Always close files in distutils code and tests (#10252).
diff --git a/Lib/distutils/tests/test_dir_util.py b/Lib/distutils/tests/test_dir_util.py
index a1647fb..aa9f9eb 100644
--- a/Lib/distutils/tests/test_dir_util.py
+++ b/Lib/distutils/tests/test_dir_util.py
@@ -88,8 +88,10 @@
mkpath(self.target, verbose=0)
a_file = os.path.join(self.target, 'ok.txt')
f = open(a_file, 'w')
- f.write('some content')
- f.close()
+ try:
+ f.write('some content')
+ finally:
+ f.close()
wanted = ['copying %s -> %s' % (a_file, self.target2)]
copy_tree(self.target, self.target2, verbose=1)