Python 3.9.7x64 and gVim 8.2.3582_x64

[petrisch]

Steps to reproduce

I have:

+python/dyn
+python3/dyn
DDYNAMIC_PYTHONDLL="python27.dll"
DDYNAMIC_PYTHONDLL="python39.dll"

And C:\Python39 as well as C:\Python27 in the PATH.
Also PYTHONPATH and PYTHON3_HOME pointing to the same path.

let g:python3_host_prog="C:/Python39"
set pythonthreedll="C:/Python39/python39.dll"
Is in my .vimrc

Still
echo has("python") gives 1, but
echo has("python3") gives 0

Expected behaviour

I was trying to enable Youcompleteme, which was compiling fine, but finds no python when getting startet.
Any hint, that the two versions in the title are maybe not compatible?
What's the best version to use?

Operating system

Windows10

Version of Vim

gVim 8.2.3582_x64

Logs and stack traces

No response

[chrisbra]

Does it look different if you first do:

echo has("python3")
echo has("python")

[k-takata]

Did you get the binary from vim-win32-installer, or compile it by yourself?
Do you use the 64-bit version of python3?

[petrisch]

@chrisbra what do you mean, if i do the python3 first? That gives the same, why should it be different? Possible reason?

@k-takata Yes the binary, and yes python3 is 64bit.

I will try a binary from tuxproject next, but I'm still curious if this is really the problem of compatibility.

[chrisbra]

I have asked, because on some systems, it won't be possible to load both python and python3 into the same process. See e.g. this answer on stackoverflow: https://vi.stackexchange.com/questions/779/how-do-i-get-vim-to-be-able-to-run-both-python-and-python3-on-a-linux-system-in/2231#2231

I am not sure, what the situation is on Windows, so I figured asking for a different order is the easiest way to rule that one out :)

So do you need both python for Vim? Can you say where you downloaded both python versions from? BTW: I just noticed:

let g:python3_host_prog="C:/Python39"
set pythonthreedll="C:/Python39/python39.dll"

please use :let &pythonthreedll="<path>". When using :set the " is considered a comment character. So please from within your vim, check the output of :set pythondll? pythonthreedll? and make sure it points to the correct dll.

[petrisch]

set => let g:
Did the trick, thanks for that one. I should have seen that, I was just copy pasting it without thinking :-(

Now ycm shows up, but there are still errors.
About the two installs. I'm unshure if vim still needs python2 for some reason.
I for myself don't. So is it still, that python should point to python27 and python3 to python39?

But hey so far this can be closed, thanks much for lending me a third eye ;-)