File "/Users/xxxx/Library/Python/2.7/lib/python/site-packages/prompt_toolkit/key_binding/key_processor.py", line 275, in process_keys
self._process_coroutine.send(key_press)
File "/Users/xxxx/Library/Python/2.7/lib/python/site-packages/prompt_toolkit/key_binding/key_processor.py", line 182, in _process
self._call_handler(matches[-1], key_sequence=buffer[:])
File "/Users/xxxx/Library/Python/2.7/lib/python/site-packages/prompt_toolkit/key_binding/key_processor.py", line 325, in _call_handler
handler.call(event)
File "/Users/xxxx/Library/Python/2.7/lib/python/site-packages/prompt_toolkit/key_binding/key_bindings.py", line 79, in call
return self.handler(event)
File "/Users/xxxx/.pyvimrc", line 67, in save_and_execute_python_file
if editor_buffer.filename is None: