use with open(...) instead of manually close file

Cython/Debugger/Cygdb.py

@@ -138,8 +138,8 @@ def main(path_to_debug_info=None, gdb_argv=None, no_import=False):
     tempfilename = make_command_file(path_to_debug_info, no_import=no_import)
     logger.info("Launching %s with command file: %s and gdb_argv: %s",
         options.gdb, tempfilename, gdb_argv)
-    tempfile_fd = open(tempfilename)
-    logger.debug('Command file (%s) contains: """\n%s"""', tempfilename, tempfile_fd.read())
+    with open(tempfilename) as tempfile:
+        logger.debug('Command file (%s) contains: """\n%s"""', tempfilename, tempfile.read())
         logger.info("Spawning %s...", options.gdb)
         p = subprocess.Popen([options.gdb, '-command', tempfilename] + gdb_argv)
         logger.info("Spawned %s (pid %d)", options.gdb, p.pid)
@@ -152,8 +152,7 @@ def main(path_to_debug_info=None, gdb_argv=None, no_import=False):
                 pass
             else:
                 break
-    logger.debug("Closing temp command file with fd: %s", tempfile_fd)
-    tempfile_fd.close()
+        logger.debug("Closing temp command file with fd: %s", tempfile.fileno())
     logger.debug("Removing temp command file: %s", tempfilename)
     os.remove(tempfilename)
     logger.debug("Removed temp command file: %s", tempfilename)