Use value type with SI units in Python.
https://github.com/sunoru/units
Author: スノル [email protected]
Introduction
With this library, you can use value type with SI units.
Building
from source:
Install the dependencies:
You can alternatively use apt-get to install them:
$ apt-get install python-traits
Download the latest units library from: https://www.sunoru.com/code/units-0.2.0/
Extract the source distribution and run:
$ python setup.py build $ python setup.py install
Getting the code
The code is hosted at Github
$ git clone git://github.com/sunoru/units.git $ cd units
Using
API:
Use units.api.V to generate values with units.
>>> from units.api import V
>>> a = V('5m/s^2')
>>> t = V('2.5s')
>>> s = 0.5 * a * t ** 2
>>> print s
15.625 m
>>> print s ** 2
244.140625 m^2
Use the HasUnit or HasUnitComplex to act as a trait that has units. (See the traits.)
>>> from units.api import HasUnit
>>> from traits.api import HasTraits
>>> from math import pi
>>> class Cone(HasTraits):
radius = HasUnit
height = HasUnit('m')
# use a symbol to force the trait to have a length unit.
def get_volume(self):
return 1. / 3 * pi * self.radius * self.radius * self.height
def get_surface_area(self):
return pi * self.radius * (self.radius **2 + self.height **2)**0.5
# note that you have to use x**0.5 to fit the ValueUnit type.
>>> cone = Cone(radius=V('4m'), height=3)
>>> cone.get_volume()
50.2654824574 m^3
>>> cone.get_surface_area()
62.8318530718 m^2
License
Copyright [sunoru]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.