defcon

library0.12.2pypypi✓ verified 85d ago

defcon provides a set of flexibly object-oriented Python classes for representing and manipulating UFO font data. It is used in font tooling like fontmake and is the recommended Python layer for UFO font development. Current version 0.12.2, with active development on GitHub.

devops

pip install defcon

github ↗homepage ↗

INSTALL

IMPORT

SIG · DEFCON

defcon

devopspythonv0.12.2

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Font

✓ from defcon import Font

✗ import defcon; defcon.Font()

Direct import of submodules is correct, not package attribute access.

Opens a UFO file, reads font info, and adds a new glyph.

from defcon import Font from defcon.objects.glyph import Glyph # Open a UFO font font = Font('MyFont.ufo') print(font.info.unitsPerEm) # Create a new glyph glyph = Glyph() glyph.name = 'A' font.insertGlyph(glyph, name='A') # Save (if needed: font.save())

Debug

Known issues

breakingdefcon 0.12.0 dropped support for Python 2 and older UFO versions.

fix

Upgrade to Python 3.9+ and ensure your UFO files conform to UFO 3.

affects: >=0.12.0

gotchaModifying a Font object does not automatically save to disk; you must call .save() explicitly.

fix

Always call font.save() after making changes if persistence is desired.

affects: all

gotchaGlyph objects are not automatically anchored to a Font; insert them via font.insertGlyph() or font.glyphs.append(). Direct assignment may lose data.

fix

Use font.insertGlyph(glyph) or append to font.glyphs list to properly register the glyph.

affects: all

Errors

Common errors & fixes

AttributeError: module 'defcon' has no attribute 'Glyph'

Defcon's top-level exports changed; Glyph is no longer directly on defcon.

fix

Use from defcon.objects.glyph import Glyph or from defcon import Glyph (if available). In recent versions, import from defcon.objects.

TypeError: 'NoneType' object is not iterable when iterating font.glyphs

Font object not properly initialized or file path invalid.

fix

Ensure the UFO path exists and is a valid .ufo directory. Check that the font was loaded successfully.

defcon.errors.UFOError: File format not supported

UFO file is corrupt or uses an older version not supported by defcon.

fix

Use a UFO 3 compliant source. If upgrading from UFO 2, convert via ufoLib or ufo2ft.

Upgrade

Version history

0.12.2latest on PyPI · released Jul 16, 2025

Audit

Dependencies

No dependency data recorded yet.

Agent activity

5 hits · last 30 days

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Resources

githubhttps://github.com/robotools/defcon ↗

homepagehttps://github.com/robotools/defcon ↗