https://github.com/gkjohnson/pint-unit-investigation
Basic scripts to investigate the available data that can be extracted from Pint
https://github.com/gkjohnson/pint-unit-investigation
conversion engineering investigation pint python quantities units
Last synced: 6 months ago
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Basic scripts to investigate the available data that can be extracted from Pint
- Host: GitHub
- URL: https://github.com/gkjohnson/pint-unit-investigation
- Owner: gkjohnson
- Created: 2017-08-09T02:19:05.000Z (about 8 years ago)
- Default Branch: master
- Last Pushed: 2018-07-21T06:09:04.000Z (about 7 years ago)
- Last Synced: 2025-02-02T01:12:17.747Z (8 months ago)
- Topics: conversion, engineering, investigation, pint, python, quantities, units
- Language: Python
- Homepage:
- Size: 217 KB
- Stars: 4
- Watchers: 3
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# pint-unit-investigation
Some basic scripts to investigate the available data that can be extracted from [Pint](https://github.com/hgrecco/pint) for use in autocomplete UIs and the possible problems involved in custom unit definition.
## [list_all_units.py](scripts/list_all_units.py)
Lists all prefixes, suffixes, and units available in pint which can be combined to generate all possible available units.
The output of the script is available [here](outputs/all-units.md).
## [list_all_dimensions_groups.py](scripts/list_all_dimension_groups.py)
Lists all unit dimensions and units within each category, all of which can be converted between.
The output of the script is available [here](outputs/dimension-groups.md)
## [list_all_base_unit_groups.py](scripts/list_all_base_unit_groups.py)
Lists all base units (and dimension) and units within each category, all of which can be converted between.
The output of the script is available [here](outputs/base-unit-groups.md)
## [guarantee_convertible.py](scripts/guarantee_convertible.py)
Converts to and from every unit in every unit set to guarantee that they are all convertable using Pint's `Quantity.to` function.
#### Temperature Conversion Problem
Checking for unit compatibility using the expression `ureg.Quantity(1, unit1) + ureg.Quantity(1, unit2)` threw an error when converting between temperatures, even when the two units were the same:
```
pint.errors.OffsetUnitCalculusError: Ambiguous operation with offset unit (degF, degF)
```
[This issue](https://github.com/hgrecco/pint/issues/386) discusses a related problem with a possible solution being to create the registry with:
```python
ureg = UnitRegistry(autoconvert_offset_to_baseunit=True)
```
And [here](http://pint.readthedocs.io/en/latest/nonmult.html) is some other documentation on why.
## [custom_units.py](scripts/custom_units.py)
Script that imports custom unit definitions and defines a new unit dimension
#### Unicode Character Problem
It seems that library chokes on importing the unicode degree character (found in the custom units file) and gives the following error:
```
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc2 in position 0: ordinal not in range(128)
```
A few options:
- This deserve some more investigation to understand how python handles strings and encodings and submit a PR or issue for Pint
- Avoid using special characters in unit definitions
- Do a special transform for display to convert to a string that pint understands
#### Token Characters Problem
Token characters like `+`, `-`, `%`, `*`, etc that python uses in expressions cannot be used as or in unit strings. The full list of token characters can be found [here](https://github.com/hgrecco/pint/blob/master/pint/compat/tokenize.py#L65). This is primarily a problem for the `%` character. If we feel strongly enough we can submit a PR or an issue.
This issue is about this same problem:
https://github.com/hgrecco/pint/issues/429