Execute line(s) of python script in Vim

Question

I just started using Vim for my main IDE, and one of my frequently used functions in the previous IDE is "execute selection in python".

I've learned that there are two ways in executing the code in python, one is :python3 {expression} and the other one is :w python3

What I want to do is execute selected line(s) of the script in vim without refreshing(closing) the python console.

It looks like :python3 {expression} does not close the python console, so after I used :python3 a=3 , command :python3 print(a) returns proper value 3. However, I think this function does not have a "selection feature" in it. Although :help python shows the [range] argument, but I can't understand how to use it.

On the other hand, the second function has the selection feature (ex. :1,3w !python3) but it seems the python console is refreshed(=closed) everytime I use the function.

I guess adding simple function to .vimrc will do for my purpose but couldn't find one. Any help will be really appreciated!

Knowblesse · Accepted Answer · 2020-10-29 05:32:04Z

2

Found the answer!

I solved it by making a simple custom commands.

python3 << EOL
import vim

def ExecuteSelectedLine(l1, l2):
    for i in range(l1-1,l2):
        print(">>" + vim.current.buffer[i])
        exec(vim.current.buffer[i],globals())
EOL
command! -range Eval <line1>,<line2> python3 ExecuteSelectedLine(<line1>, <line2>)

How to use

Run only 1st to 3rd lines of script in python :1,3Eval
Run the current line in python :Eval
Run visually selected parts of script in python :'<,'>Eval

range selection works with -range option, and using python's "exec" function with globals() option, persistency remains (no refreshing).

I guess my coding style, trying different code snippets in a console and finalizing the main script, is a weird way to code since I couldn't find similar attempts in the communities.

Thanks to all!

answered Oct 29, 2020 at 5:32

Knowblesse

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Comments

tetektoza · Accepted Answer · 2020-10-29 02:53:46Z

1

I don't understand the question. Command

:1,3w !python3

Should do the trick, what do you exactly mean by saying "python console is refreshing everytime I use the function"? If you mean, that it waits for enter key to be pressed to go back to vim, it is just natural.

You may also use:

:'<,'>w !python3

While previously using Visual Mode to select certain block of code. Do you want to execute the code in a new terminal window?

answered Oct 29, 2020 at 2:53

tetektoza

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3 Comments

Knowblesse Over a year ago

I mean the result of the previously executed !python command vanish after closing the terminal. For example, if there is two lines of code a = 3 print(a) and I execute the first line :1w !python3 and then the second line :2w !python3, the second command will return error that there is no variable named a.

tetektoza Over a year ago

Hmm.. I don't think you can do anything with that, since it only executes certain lines. I know what you mean, you probably want to get the same result as you may get while writing in Python's IDLE, so the variable is written somewhere in memory for later use, right? As far as I know, it only works as executing lines, so unless you provide a value declaration before an execution of print function, it won't have an access to this certain value. Have I understood you well?

Knowblesse Over a year ago

Yes, you got it perfectly right! I would normally give up, but the :py3 command holds the variables as I wanted, so I'm looking into that.

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