Importing values from vim to python in vim9

I installed vim 9 but still have multiple functions written in old vimscript.

I've read that functions written in old vimscript still work.

However I noticed that importing variables into Python `vim.eval("a:myvariable")` no longer works

I don't always get the right values imported.

Example :

:call MyFunction("12", "14") 

function! MyFunction("variable1, variable2") 

python3 << endpython 

variable1 = vim.eval("a:variable1") 

variable2 = vim.eval("a:variable2") 

print(variable1 + " " + variable2) 

endpython 

endfunction

What's wrong in above code?

Or better... why doesn't it work anymore in vim9?

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