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- [Instructor] I write a lot of Python code

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and love to quickly test the code I'm writing.

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Switching to a terminal and writing Python

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in the name of the file gets annoying

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and I'd like to do it from inside Vim.

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To do this, you'll add a new command.

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First, let's see how you can ran an external command

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from Vim using the exclamation mark.

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Let's open Vim.

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Hello.py and now colon exclamation mark

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and the name of the command that we'd like to run.

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In our case I'm going to run the ls command

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which lists the files in the directory.

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If you're on Windows, instead of ls write dir, D-I-R.

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And we run the ls and we see the input

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and once we hit enter, we're back to Vim.

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And now let's define our command.

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So colon com exclamation mark.

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This means define a command and override an existing one.

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Py is the name of the command and then exclamation mark

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to run an external command python,

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which is a command to run and give it the parameter percent.

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Percent is expanded to the name of the file.

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And Enter.

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And now we can use it.

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So colon Py, Enter.

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And we see that the output of hello Vim from our program

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and when we hit Enter, we're back in our code.

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Very handy.

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Don't forget to add this to your vimrc.

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You can do much more with commands.

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Write functions, accept arguments and more.

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With accommodation it is excellent.