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# hplgit / physical-quantities Public

The PhysicalQuantity class made independent of K. Hinsen's ScientificPython package.

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# physical-quantities

The PhysicalQuantity class made independent of K. Hinsen's ScientificPython package. This class is very useful for computation involving numbers with units.

## Demo

```    >>> from PhysicalQuantities import PhysicalQuantity as p  # short hand
>>> distance1 = p('10 m')
>>> distance2 = p('10 km')
>>> total = distance1 + distance2
>>> total
PhysicalQuantity(10010.0,'m')
>>> total.convertToUnit('km')
>>> total.getValue()
10.01
>>> total.getUnitName()
'km'
>>> total = total.inBaseUnits()
>>> total
PhysicalQuantity(10010.0,'m')
>>>
>>> t = p(314159., 's')
>>> # convert to days, hours, minutes, and second:
>>> t2 = t.inUnitsOf('d','h','min','s')
>>> t2_print = ' '.join([str(i) for i in t2])
>>> t2_print
'3.0 d 15.0 h 15.0 min 59.0 s'
>>>
>>> e = p('2.7 Hartree*Nav')
>>> e.convertToUnit('kcal/mol')
>>> e
PhysicalQuantity(1694.2757596034764,'kcal/mol')
>>> e = e.inBaseUnits()
>>> str(e)
'7088849.77818 kg*m**2/s**2/mol'
>>>
>>> freeze = p('0 degC')
>>> freeze = freeze.inUnitsOf ('degF')
>>> str(freeze)
'32.0 degF'
>>>```

Run

``````pydoc PhysicalQuantities
``````

to see an overview of all the physical units and their notation supported by the `PhysicalQuantities` module.

## Installation

``````sudo pip install  -e git+https://github.com/hplgit/physical-quantities.git#egg=physical-quantities
``````

Or

``````git clone https://github.com/hplgit/physical-quantities.git
cd physical-quantities
sudo python setup.py install
``````

## Note

The `PhysicalQuantities` module was developed by Dr. Konrad Hinsen and appears in the ScientificPython package. Unfortunately, ScientificPython requires NumPy version 1.8 or less, and that is why H. P. Langtangen made this `PhysicalQuantities` module independent of the ScientificPython package such that it is easy in any project to compute with units.

## Python 3 version

The `PhysicalQuantities.py` file in the present directory is for Python 2. There is an experimental Python 3 version in the subdirectory `py23`, which depends on the `future` package.

## About

The PhysicalQuantity class made independent of K. Hinsen's ScientificPython package.

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