Python 2.6 GzipFile is not a context manager.

mocket/mocket.py

@@ -247,8 +247,10 @@ def true_sendall(self, data, *args, **kwargs):
                 if line_no + 1 in gzipped_lines:
                     gzip_buffer = io.BytesIO()
                     gzip_file = gzip.GzipFile(mode='wb', fileobj=gzip_buffer)
-                    gzip_file.write(line)
-                    gzip_file.close()
+                    try:
+                        gzip_file.write(line)
+                    finally:
+                        gzip_file.close()
                     line = gzip_buffer.getvalue()
                 r_lines.append(line)
             encoded_response = b'\r\n'.join(r_lines)
@@ -277,8 +279,11 @@ def true_sendall(self, data, *args, **kwargs):
                 try:
                     line = decode_utf8(line)
                 except UnicodeDecodeError:
-                    with gzip.GzipFile(mode='rb', fileobj=io.BytesIO(line)) as f:
+                    f = gzip.GzipFile(mode='rb', fileobj=io.BytesIO(line))
+                    try:
                         line = f.read(len(line))
+                    finally:
+                        f.close()
                     line = decode_utf8(line)
                     gzipped_lines.append(line_no + 1)