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Project Description

Customized fork of http://github.com/limist/py-moneyed which adds ability to extend the core Money class.

The need to represent instances of money frequently arises in software development, particularly any financial/economics software. To address that need, the py-moneyed package provides the classes of Money and Currency, at a level more useful than just using Python’s Decimal class, or ($DEITY forbid) the float primitive. The package is meant to be stand-alone and easy to either use directly, or subclass further. py-moneyed is BSD-licensed.

Some of the py-moneyed code was first derived from python-money available via this URL: http://code.google.com/p/python-money/ Because that Google Code version has been inactive since May 2008, I forked it and modified it for my needs in 2010. Compared to python-money, major changes here in py-moneyed include separating it from Django usage, tightening types handling in operators, a complete suite of unit tests, PEP8 adherence, providing a setup.py, and local currency formatting/display.

Usage

On to the code! The Money class is instantiated with:

  • An amount which can be of type int, string, float, or Decimal. It will be converted to a Decimal internally. Therefore, it is best to avoid float objects, since they do not convert losslessly to Decimal.
  • A currency, which usually is specified by the three-capital-letters ISO currency code, e.g. USD, EUR, CNY, and so on. It will be converted to a Currency object.

For example,

from moneyed import Money
sale_price_today = Money(amount='99.99', currency='USD')

You then use Money instances as a normal number. The Money class provides operators with type checking, matching currency checking, and sensible dimensional behavior, e.g. you cannot multiply two Money instances, nor can you add a Money instance to a non-Money number; dividing a Money instance by another results in a Decimal value, etc.

The Currency class is provided with a complete dictionary of ISO 4217 currencies data, each key (e.g. ‘USD’) mapping to a Currency instance with ISO numeric code, canonical name in English, and countries using the currency. Thanks to the python-money developers for their (possibly tedious) data-entry of the ISO codes!

All of these are available as pre-built Currency objects in the moneyed module.

You can also pass in the arguments to Money as positional arguments. So you can also write:

>>> from moneyed import Money, USD
>>> price = Money('19.50', USD)
>>> price
19 USD

>>> price.amount
Decimal('19.50')

>>> price.currency
USD

>>> price.currency.code
'USD'

Formatting

You can print Money object as follows:

>>> from moneyed.localization import format_money
>>> format_money(Money(10, USD), locale='en_US')
'$10.00'

Testing

Unit-tests have been provided, and can be run with tox (recommended) or just py.test.

If you don’t have tox installed on your system, it’s a modern Python tool to automate running tests and deployment; install it to your global Python environment with:

sudo pip install tox

Then you can activate a virtualenv (any will do - by design tox will not run from your globally-installed python), cd to the py-moneyed source directory then run the tests at the shell:

cd where/py-moneyed-source/is
tox

If you do not have all versions of Python that are used in testing, you can use pyenv. After installing pyenv, install the additional plugin pyenv-implict.

The py-moneyed package has been tested with Python 2.6, 2.7, 3.2, 3.3 and PyPy 2.1.

Future

Future versions of py-moneyed may provide currency conversions or other capabilities, dependent on feedback and usage.

Release History

Release History

0.6.2

This version

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0.6.1

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0.5.2

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0.5.1

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Download Files

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
ud-py-moneyed-0.6.2.tar.gz (16.8 kB) Copy SHA256 Checksum SHA256 Source Apr 6, 2016

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