prefixed
Prefixed alternative numeric library
Decision gist · record as of 2026-08-14
Yes, if you need automatic SI or IEC prefix formatting for numeric display. The package is stable, has no dependencies, and works across Python 2.7 and 3.5–3.13. The aging maintenance status is a minor concern for new features but not a blocker for a focused, mature library. MPLv2.0 copyleft licensing requires disclosure of modifications if you redistribute.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low install friction with no runtime dependencies.
- Maintenance status is aging—last release was in September 2024, though the repository remains active.
License · maintenance · safety
MPLv2.0 (copyleft) — Licensed under MPLv2.0 (copyleft). You must disclose source code modifications and distribute under the same license if you modify and redistribute the package.
last release 2024-09-02 (711 days) · last repo commit 2025-04-20 · 27 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 903,562 downloads/mo, #4,767 on PyPI
Alternatives
Verify before relying
from prefixed import Float
f'{Float(3250):.2h}'
# Output: '3.25k'
f'{Float(0.00001534):.2h}s'
# Output: '15.34μs'- Whether the aging maintenance status affects stability or bug-fix responsiveness for your use case.
- Compatibility with Python versions beyond 3.13 or future breaking changes in the float formatting API.
What it is and what it does
Prefixed extends Python's built-in float with custom formatting directives that automatically scale numbers into human-readable form with SI or IEC prefixes. When you format a Float instance using 'h' (SI), 'k' (IEC full), or 'm' (IEC short) presentation types, the number is divided by the appropriate power of 10 or 2 and paired with the corresponding prefix symbol—so 3250 becomes '3.25k', and 0.00001534 becomes '15.34μs'. The class inherits from float, so it behaves identically to a regular float in arithmetic and comparisons; math operations with other real numbers return Float instances, preserving the formatting capability.
The package supports a wide range of prefixes: SI includes Quetta down to Quecto, while IEC covers Yobi down to Kibi. You can also initialize Float from strings like '2k' or '2Ki' and they parse correctly. Additional formatting options include significant-digit mode (uppercase presentation types), margin adjustment to shift prefix thresholds, and a space-before-prefix flag.
Use it for
- Display file sizes or network throughput with binary prefixes: format(Float(42467328), '.2k') + 'B' yields '40.50MiB'.
- Format scientific measurements with SI prefixes: represent time intervals like 15.34 microseconds or frequency in gigahertz.
- Parse and work with human-readable numeric strings in configuration or user input: Float('2k') == 2000.0.
- Build terminal output or logging that scales automatically: avoid hardcoding unit conversions for different magnitude ranges.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need automatic SI or IEC prefix formatting for numeric display.
The package is stable, has no dependencies, and works across Python 2.7 and 3.5–3.13. The aging maintenance status is a minor concern for new features but not a blocker for a focused, mature library. MPLv2.0 copyleft licensing requires disclosure of modifications if you redistribute.
Install
prefixed on PyPI
Before you install
Low install friction with no runtime dependencies. Maintenance status is aging—last release was in September 2024, though the repository remains active.
License in practice
Licensed under MPLv2.0 (copyleft). You must disclose source code modifications and distribute under the same license if you modify and redistribute the package.
Quickstart
from prefixed import Float
f'{Float(3250):.2h}'
# Output: '3.25k'
f'{Float(0.00001534):.2h}s'
# Output: '15.34μs'Verify before relying
- Whether the aging maintenance status affects stability or bug-fix responsiveness for your use case.
- Compatibility with Python versions beyond 3.13 or future breaking changes in the float formatting API.
Package facts
| License | MPLv2.0 copyleft |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Aging 711 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 903,562 / month, #4,767 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 4 - BetaIntended Audience :: DevelopersLicense :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)Operating System :: Microsoft :: WindowsOperating System :: POSIXProgramming Language :: PythonProgramming Language :: Python :: 2.7Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.5Programming Language :: Python :: 3.6Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPyTopic :: Terminals |
Evidence: prefixed-0.9.0-py2.py3-none-any.whl
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See also binary · bitmath · sigfig · py-multicodec · pksuid · flake8-use-fstring · prefixdate · rounders · mgrs · overpunch