How to make Vim remember a defined variable in Python?

Question

I want Vim to remember a defined Python variable when I run it again. Is there a way?

Example:

[n] : line n on vim.

[1] a = 2

[2] b = a + 1

[3] print(b)

If I write:

:1,2w !python

and then:

:3w !python

I'd like to get the answer:

Instead, I'm getting:

Traceback (most recent call last):
  File "< stdin >", line 1, in < module >
NameError: name 'b' is not defined

shell returned 1

thanks, I will study more about getting help on stackoverflow. — rdidier-
– rdidier-, Commented Nov 25, 2019 at 11:59
Strictly speaking, Vim does remember the variable - all the source code is still loaded in the buffer; you just ask Vim to pass only parts of the buffer to Python. You rather want the Python interpreter to remember program state, something which is at odds with the :! command, which launches a fresh instance of the executable each time. — Ingo Karkat
– Ingo Karkat, Commented Nov 25, 2019 at 12:36

the Tin Man · Accepted Answer · 2019-11-25 22:30:27Z

1

When you run !python you run an external Python binary. Every time you run !python you run a new non-initialized Python that doesn't remember anything from your previous session.

To remember your calculations you need to use the internal, built-in Python. Use :python or :python3.

Also see "Execute Python from within current file".

edited Nov 25, 2019 at 22:30

the Tin Man

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answered Nov 25, 2019 at 12:48

phd

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