It would be nice if function and method calls be highlighted by default as is done in most other editors. It can be achieved with something like that: syntax match pythonFunction /\v([^[:cntrl:][:space:][:punct:][:digit:]]|_)([^[:cntrl:][:punct:][:space:]]|_)*\ze(\s?\()/ Here's how it looks like: before  after 
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CH-DanReif commentedon May 10, 2018
This belongs in https://github.com/vim-python/python-syntax . Once it's updated there, open an issue here and we'll rebuild and pull in the changed version. If @vim-python won't accept your update to make this change, the next step is to fork that repo, make the change in your fork, and then make a PR to change https://github.com/sheerun/vim-polyglot/blob/e2404449e4f961c5e6c0e2689078612b36d776c2/build#L220 .
Either way, there's not much I can do about this at the moment, here.
antoinemadec commentedon Feb 26, 2020
@silenc3r @CH-DanReif , for info, this has been added in python-syntax after vim-python/python-syntax@6ce77d0
More info in the pull request: vim-python/python-syntax#63