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Python library for computing with numbers with units

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Copyright (C) 2006-2015 Juan Reyero (

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

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.

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Magnitude is a library for computing with numbers with units:

>>> print "10 m/s ** 2 ->", mg(10, 'm/s') ** 2
10 m/s ** 2 -> 100.0000 m2 / s2
>>> print (mg(10, 'm') * 2 / (10, 'm/s2')).sqrt()
1.4142 s
>>> tsq = mg(10, 'm') * 2 / (10, 'm/s2')
>>> print tsq ** 0.5
1.4142 s
>>> print mg(1, "lightyear") / mg(1, "c")
>>> 31557600.0000 s
>>> y = mg(1, "lightyear") / (1, "c")
>>> y.ounit("year")
<magnitude.magnitude instance at 0x81440>
>>> print y
1.0000 year
>>> yd = y.ounit('day')
>>> print yd
365.2500 day
>>> output_precision(0)
>>> print yd
365 day

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