Issue #10266: uu.decode didn't close in_file explicitly when it was given

as a filename.  Patch by Brian Brazil.

Lib/test/test_uu.py

@@ -196,6 +196,23 @@ class UUFileTest(unittest.TestCase):
         finally:
             self._kill(f)
 
+    def test_decode_filename(self):
+        f = None
+        try:
+            support.unlink(self.tmpin)
+            f = open(self.tmpin, 'wb')
+            f.write(encodedtextwrapped(0o644, self.tmpout))
+            f.close()
+
+            uu.decode(self.tmpin)
+
+            f = open(self.tmpout, 'rb')
+            s = f.read()
+            f.close()
+            self.assertEqual(s, plaintext)
+        finally:
+            self._kill(f)
+
     def test_decodetwice(self):
         # Verify that decode() will refuse to overwrite an existing file
         f = None

Lib/uu.py

@@ -92,10 +92,14 @@ def decode(in_file, out_file=None, mode=None, quiet=False):
     #
     # Open the input file, if needed.
     #
+    opened_files = []
     if in_file == '-':
         in_file = sys.stdin.buffer
     elif isinstance(in_file, str):
         in_file = open(in_file, 'rb')
+        opened_files.append(in_file)
+
+    try:
         #
         # Read until a begin is encountered or we've exhausted the file
         #
@@ -122,7 +126,6 @@ def decode(in_file, out_file=None, mode=None, quiet=False):
         #
         # Open the output file
         #
-    opened = False
         if out_file == '-':
             out_file = sys.stdout.buffer
         elif isinstance(out_file, str):
@@ -132,7 +135,7 @@ def decode(in_file, out_file=None, mode=None, quiet=False):
             except AttributeError:
                 pass
             out_file = fp
-        opened = True
+            opened_files.append(out_file)
         #
         # Main decoding loop
         #
@@ -150,8 +153,9 @@ def decode(in_file, out_file=None, mode=None, quiet=False):
             s = in_file.readline()
         if not s:
             raise Error('Truncated input file')
-    if opened:
+    finally:
-        out_file.close()
+        for f in opened_files:
+            f.close()
 
 def test():
     """uuencode/uudecode main program"""

Misc/NEWS

@@ -59,6 +59,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #10266: uu.decode didn't close in_file explicitly when it was given
+  as a filename.  Patch by Brian Brazil.
+
 - Issue #10160: Speed up operator.attrgetter.  Patch by Christos Georgiou.
 
 - logging: Added style option to basicConfig() to allow %, {} or $-formatting.