how to bind the prompt key to 2to3.py?

问题

I have write a vimsrcipt to bind F3 key to change python2 file into python3 file.

map <f3> :w<cr>:! D:\Python34\python D:\Python34\Tools\Scripts\2to3.py  -w %<cr>

I feel that it should be improved for useage. It works in the steps:

step1: open the test.py( in the form of python2) in gvim
step2: press F3
step3: close the test.py( in the form of python2)
step4: open the test.py(now ,it is in the form of python3)

Now i want to make a little progress, when i press F3 ,the test.py will be changed into python3 form,not to reopen it.
How can i?

回答1:

You can avoid steps 3 and 4 either by explicitly reloading the file via :e:

nnoremap <f3> :w<cr>:! D:\Python34\python D:\Python34\Tools\Scripts\2to3.py  -w %<cr>:e<cr>

or by turning on

:set autoread

^{Again, you should use :noremap; and specify the proper mode (normal mode).}

来源：https://stackoverflow.com/questions/25481506/how-to-bind-the-prompt-key-to-2to3-py