LSD - pounds, shillings and pence

A library for converting between pre-decimal British currency and decimal ('new pence') currency.

Usage

>>> import lsd
>>> from decimal import Decimal
>>> lsd.pounds_shillings_and_pence(Decimal("1.49"))
(1, 9, 10)
>>> lsd.pounds_and_new_pence(19, 19, 6)
Decimal('19.975')

For more usage examples, see the file examples.md

Calculations use the built-in Decimal class for amounts of pounds in new money. Calculation is thus dependent on the constraints of the Decimal class. This does not do arbitrary-precision arithmetic. Thus there are some numbers which are too big to be converted. You can alter these limits by setting the Decimal context in your own code. See [[https://docs.python.org/2/library/decimal.html#context-objects]] or [[https://docs.python.org/3.7/library/decimal.html#context-objects]].

Development

Now using poetry. To run tests do:

poetry run python -m unittest

Thanks

There are only a small number of tests for this project. That's thanks to the awesome hypothesis project which generates test cases for unit tests. It's really powerful for checking edge cases. See [[https://github.com/HypothesisWorks/hypothesis]]