nbp_rates
A modular Python library for providing NBP (Narodowy Bank Polski) exchange rates with both offline and online support. Very fast and easy to use.
Features
- Offline Support: Includes historical exchange rates data from 1984 to 18-September-2026
- Online Fallback: Automatically fetches from NBP API for dates after 18-September-2026
- Dual Table Support: Supports both Table A (major currencies) and Table B (minor currencies)
- Smart Fallback: Optionally searches last available rate before given date (handles holidays, weekends and missing data)
- Super Fast: Optimized for speed with most queries served from local data with minimal API calls
- Easy and Powerful: Simple to use with 200+ currencies supported
- Precise and exact output: No rounding within library. Results provided as string to avoid floating-point rounding issues
- Reliable: As most of data is served offline, it is not affected by NBP API downtime, responsiveness or rate limits
- Flexible Date Input: Accepts
datetime.date,datetime.datetime, or ISO format strings (YYYY-MM-DD) - No external dependencies: Pure Python with standard library
- Daily Updates: new version of library released daily with the latest exchange rates available offline
Installation
Install from PyPI:
pip install nbp_rates
Or install in development mode from the repository:
git clone https://github.com/varciasz/nbp_rates.git
cd nbp_rates
pip install -e .
Requirements
- Python 3.6 or higher
- No external dependencies (uses only Python standard library)
Usage
Basic Usage
Get the exchange rate for a specific date and currency:
from nbp_rates import ProvideCurrencyRate
from datetime import date
# Get USD rate for a specific date
rate = ProvideCurrencyRate(date(2024, 1, 15), 'USD')
print(f"USD rate on 2024-01-15: {rate}")
# Using a string date (ISO format)
rate = ProvideCurrencyRate('2024-01-15', 'EUR')
print(f"EUR rate on 2024-01-15: {rate}")
# Using datetime object
from datetime import datetime
rate = ProvideCurrencyRate(datetime(2024, 1, 15, 10, 30), 'GBP')
print(f"GBP rate on 2024-01-15: {rate}")
Using Fallback
Enable fallback to search up to 31 days back for an available rate (useful for holidays, weekends and missing data):
# Get rate for a holiday, falling back to previous business day if needed
rate = ProvideCurrencyRate(date(2024, 1, 1), 'USD', fallback=True)
print(f"USD rate: {rate}")
Return Values
- Successfully fetched rate: String representation of the exchange rate (e.g.,
"4.25") - Currency not found:
"Error - wrong currency" - Module loading error:
"Error - unable to load currency module" - Fallback limit exceeded or rate not found:
"-1"
Supported Currencies
The library supports 200+ currencies including:
Major currencies (Table A): USD, EUR, GBP, JPY, CHF, CAD, AUD, and many more
Minor currencies (Table B): INR, CNY, MXN, BRL, ZAR, SGD, and many more
See the source code for the complete list of TABLE_A_CURRENCIES and TABLE_B_CURRENCIES.
API Reference
ProvideCurrencyRate(date_given, currency, fallback=False, _depth=0)
Fetches the FX rate for a given date and currency.
Parameters:
date_given(datetime.date, datetime.datetime, or str): The date for which to fetch the ratecurrency(str): ISO 4217 currency code (e.g., 'USD', 'EUR')fallback(bool, optional): If True, searches up to 31 days back for available rates. Default: False_depth(int, optional): Internal parameter for recursion tracking. Default: 0
Returns:
- str: Exchange rate as a string, or error message
Raises:
- ValueError: If the date format is invalid or currency is not recognized
SupportedCurrencies
A sorted list of all supported currency codes exposed by the package.
from nbp_rates import SupportedCurrencies
print("EUR" in SupportedCurrencies)
# True
Type: list[str]
Notes:
- The list is alphabetically sorted for easy discovery and iteration.
- It contains the union of currencies available in both NBP tables (A and B).
Data Sources
- Offline Data: Embedded exchange rate data from 1984 to 18-September-2026
- Online Data: NBP API (
https://api.nbp.pl/) for dates after the offline data cutoff
License
This project is licensed under the MIT License - see the LICENSE file for details.
Author
Sebastian Kowalik
Contributing
Contributions are welcome! Please feel free to submit a Pull Request.
Changelog
Current Version 1.7.20260920
- Library is updated daily with the latest exchange rates included offline. Last 8 digits of version number represent the date when the version was generated (YYYYMMDD).
Version 1.7
- Added
SupportedCurrencies, a sorted list of all supported currencies.
Version 1.6
- Added support for easy version checking
import nbp_rates
print(nbp_rates.__version__)
Version 1.5
- First official stable version with automated daily updates and support for 200+ currencies.
1 maintainer
Release files for nbp-rates 1.7.20260920
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| nbp_rates-1.7.20260920-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 3.0 MB
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