This release is a pre-release and may not be stable for production use.
monetils
Installation
pip install monetils
Usage
monetils provides BTC and USD classes for representing monetary amounts exactly,
without floating-point rounding artifacts.
Construction and formatting
from monetils import BTC, USD
usd = USD(1234.5)
print(str(usd)) # "1234.50"
btc = BTC(1)
print(str(btc)) # "1.00000000"
# Construct from a non-default unit
half_btc = BTC.sat(50_000_000)
print(str(half_btc)) # "0.50000000"
nineteen_ninety_nine = USD.cent(1999)
print(str(nineteen_ninety_nine)) # "19.99"
Arithmetic
from monetils import BTC, USD, CurrencyMismatchError
total = USD(10.50) + USD(5.25) # USD(15.75)
# A plain number used with +/- is treated as an amount in the currency's base unit
one_more_btc = BTC(1) + 1 # BTC(2)
# A plain number used with */÷ is a dimensionless scaling factor
doubled = BTC(1) * 2 # BTC(2)
# Mixing currencies raises CurrencyMismatchError instead of a silent wrong result
try:
BTC(1) + USD(1)
except CurrencyMismatchError:
print("rejected as expected")
Unit conversion
from monetils import BTC
one_btc = BTC(1)
one_btc.to("sat") # Decimal("100000000")
one_btc.sats # 100000000
msat_value = one_btc.to("msat")
BTC.msat(msat_value) == one_btc # True — lossless round trip
Pydantic support
BTC and USD work directly as Pydantic v2 model fields — no
wrapper type needed. This requires pydantic>=2.0,<3 to be installed in your own project;
monetils does not depend on it (it stays a zero-runtime-dependency library).
from pydantic import BaseModel
from monetils import BTC, USD
class Invoice(BaseModel):
price: USD
fee: BTC | None = None
# Accepts a plain number/string, or an existing BTC/USD instance
invoice = Invoice(price=19.99, fee="0.5")
invoice.model_dump() # {"price": USD(19.99), "fee": BTC(0.5)} — instances, unchanged
invoice.model_dump_json() # '{"price":"19.99","fee":"0.50000000"}' — the same str() convention
Invoice.model_json_schema() # describes price/fee as JSON string properties
# Invalid input (wrong currency, unparseable value) raises a standard pydantic.ValidationError
License
This project is licensed under the terms of the MIT license.
1 maintainer
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