https://github.com/elliotwutingfeng/rfc9839

Python library to check for problematic Unicode code points.
https://github.com/elliotwutingfeng/rfc9839

assignables cbor control hacktoberfest json noncharacters parse scalars security surrogates unicode xml yaml

Last synced: 2 months ago
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Python library to check for problematic Unicode code points.

• Host: GitHub
• URL: https://github.com/elliotwutingfeng/rfc9839
• Owner: elliotwutingfeng
• License: mit
• Created: 2025-09-03T22:25:46.000Z (9 months ago)
• Default Branch: main
• Last Pushed: 2026-04-07T20:56:33.000Z (2 months ago)
• Last Synced: 2026-04-07T22:31:55.186Z (2 months ago)
• Topics: assignables, cbor, control, hacktoberfest, json, noncharacters, parse, scalars, security, surrogates, unicode, xml, yaml
• Language: Python
• Homepage: https://pypi.org/project/rfc9839
• Size: 381 KB
• Stars: 1
• Watchers: 0
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE
  • Code of conduct: CODE_OF_CONDUCT.md

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README

          
# RFC9839

[![PyPI - Version](https://img.shields.io/pypi/v/rfc9839?style=for-the-badge)](https://pypi.org/project/rfc9839)

[![Coveralls](https://img.shields.io/coverallsCoverage/github/elliotwutingfeng/rfc9839?logo=coveralls&style=for-the-badge)](https://coveralls.io/github/elliotwutingfeng/rfc9839?branch=main)

[![License](https://img.shields.io/badge/LICENSE-MIT-GREEN?style=for-the-badge)](./LICENSE)

Python library to check for problematic Unicode code points.

Port of [Go library of the same name](https://github.com/timbray/rfc9839).

Based on the Unicode code-point subsets specified in [RFC9839](https://www.rfc-editor.org/rfc/rfc9839.html).

## Usage

```python

from rfc9839 import unicode_scalar, xml_character, unicode_assignable

code_point = 0xFDDA  # ARABIC LIGATURE SAD WITH MEEM WITH ALEF MAKSURA FINAL FORM

print(unicode_scalar.is_valid_code_point(code_point))  # True

print(xml_character.is_valid_code_point(code_point))  # True

print(unicode_assignable.is_valid_code_point(code_point))  # False

print(unicode_assignable.is_valid_string(chr(code_point)))  # False

print(xml_character.is_valid_utf8(chr(code_point).encode("utf-8")))  # True

```