PyCaliper/release_notes.txt at master · point85/PyCaliper · GitHub

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PyCaliper Release Notes

v1.0.1 Sept. 11, 2021
- Cleared conversion cache when setting a UOM conversion factor

v1.0.2 Sept. 19, 2021
- Upgraded to Python 3.9
- General code cleanup

v1.0.3 Nov. 19, 2021
- Changed to a specific PyCaliperException vs. generic Exception
- General code cleanup

v1.0.4 Mar. 17, 2023
- Changed inches of Mercury pressure to pound mass based.

v1.0.5 Oct. 14, 2023
- Verified on Python 3.12

v1.0.6 Jan. 11, 2024
- Created a PyPI distribution

v1.0.8, June 11, 2025:
	- Constant: fixed AVOGADRO typo
	- Prefix: used EPSILON in fromFactor() comparison
	- Quantity: checked for division by 0 in divide(double)
	- Localizer: enhanced class
	- Symbolic: defined __eq__ and __hash__
	- Unit of Measure: made __hash__ consistent with __eq__

v1.1.0, February 15, 2026:
- Claude Sonnet 4.5
Bug - Test Import Failure (test/init.py)
Fixed os.chdir("../uom") that was breaking tests when run from different locations

Performance Enhancements:
Dictionary Operations Optimization (unit_of_measure.py)
Removed unnecessary .keys() calls when checking membership (2 locations)
Optimized dict iteration in buildBaseString() - sort dict directly instead of keys
Improved multiplyOrDivide() - use tuple unpacking in for loops and .get() method
Optimized classify() - use .get() instead of checking membership then accessing
Major optimization in getConversionFactor() - replaced nested O(n²) loop with O(n) lookup using dict comprehension
Prefix Class Caching (prefix.py)

Implemented instance caching for all 22 prefix methods (milli, kilo, mega, etc.)
Previously created new objects on every call; now returns cached instances
Significant performance improvement for measurement system initialization

Symbol Generation Optimization (unit_of_measure.py)
Replaced expensive time.time_ns() call with simple counter
Much faster for intermediate unit generation

Power Calculation Optimization (unit_of_measure.py)

Replaced loop-based power calculation with math.pow() in Reducer.explodeRecursively()
More efficient and clearer code
Localizer Optimization (localizer.py)

Added @lru_cache decorator to getLC() method for language code lookup
Fixed __init__ to properly check _initialized attribute
Prevents repeated locale lookups