# Oskuvi PYX Language

> Oskuvi PYX Language makes PyCharm and other JetBrains IDEs read Cython .pyx, .pxd and .pxi files: keywords and C types coloured, plus structure, navigation and checks.

Source: https://npcoding.ca/products/oskuvi-pyx-language/
Last updated: 2026-10-22

Makes JetBrains IDEs read Cython .pyx, .pxd and .pxi files wherever the editor has no Cython support of its own.

## Product facts

- **Type:** JetBrains IDE plugin
- **Status:** Live on JetBrains Marketplace (https://plugins.jetbrains.com/plugin/35122)
- **Works in:** PyCharm, IntelliJ IDEA and other JetBrains IDEs, 2025.1 or later
- **Licence:** 7-day free trial, then a paid licence
- **Vendor:** Oskuvi, by NPCoding
- **Vendor page:** https://plugins.jetbrains.com/vendor/npcoding

## What it does

Oskuvi PYX Language makes the editor read Cython files: the .pyx, .pxd and .pxi files of your extension modules, wherever the editor has no support of its own for them.

Python's and Cython's keywords, C types, strings, numbers and comments are coloured, brackets are matched, blocks fold and the comment key works. You also get the structure of a file (its cdef functions, classes, structs and enums), going from a name to its declaration and from a cimport to its .pxd file, completion of the names a file declares and cimports, and checks for a cimport that leads nowhere.

The plugin only reads your files. It contacts no address and sends nothing anywhere.

## Who it's for

- Python developers who write Cython extension modules in PyCharm or another JetBrains IDE.
- Projects with their own .pxd files that need to find their way between declarations.

## Key features

- **Python and Cython keywords:** Keywords, C types, strings, numbers and comments, coloured.
- **Brackets, folding, comments:** Brackets matched, blocks folded, and the comment key works.
- **File structure:** The cdef functions, classes, structs and enums of a file.
- **Go to declarations:** From a name to its declaration, and from a cimport to the .pxd file.
- **Completion and checks:** Names a file declares and cimports are completed, and a cimport that leads nowhere is flagged.

## Frequently asked questions

### Can I try it first?

Yes, for 7 days at no cost. After the trial it needs a licence, and the plugin's JetBrains Marketplace page shows what it costs.

### What if my IDE already supports Cython?

Where JetBrains' own Python plugin with Cython support is loaded, Oskuvi PYX Language stands down and leaves the files to it.

### Which .pxd files does it follow?

Your project's own. Cimports from libc, libcpp, cpython, posix, numpy, openmp and cython are never flagged, and the check runs only in a project that has a .pxd file of its own.

### Does it send my code anywhere?

No. Oskuvi PYX Language only reads your files, on your machine. It contacts no address and sends nothing anywhere.

## Related products

- [Oskuvi KV Language](https://npcoding.ca/products/oskuvi-kv-language/): Makes PyCharm and other JetBrains IDEs read the .kv files of Kivy apps: rules, widgets, properties and canvas instructions.
- [Oskuvi MKO Templates](https://npcoding.ca/products/oskuvi-mko-templates/): Makes PyCharm and other JetBrains IDEs read Mako templates: ${ } expressions, Python blocks, control lines, tags and comments.
- [Oskuvi Code Metrics](https://npcoding.ca/products/oskuvi-code-metrics/): Measures the Java code you select and shows where it has grown hard to follow: per method, per class and per package.

## Built by NPCoding

Need performance work on a Python system? We build, assess and improve software.

- [Software & App Development](https://npcoding.ca/services/ai-software-engineering/): AI-powered development of startup MVPs, web platforms, SaaS, mobile apps and business systems, managed end to end by senior engineers.

*Cython is an open-source project of its own authors. Oskuvi PYX Language is not affiliated with, or endorsed by, the Cython project. Python is a registered trademark of the Python Software Foundation.*

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