Convert the units of particle physics quantities.
Project description
NatPy
Convert the units of particle physics quantities
Packages needed:
- astropy
- numpy
Basic Usage
Code levarages astropy.units.core.Unit
and astropy.units.quantity.Quantity
objects.
-
Run
import natpy
. -
Access physical constants with symbol within
const
:>>> import natpy as nat >>> nat.const.c <class 'astropy.constants.codata2018.CODATA2018'> name='Speed of light in vacuum' value=299792458.0 uncertainty=0.0 unit='m / s' reference='CODATA 2018'> >>> nat.const.hbar <class 'astropy.constants.codata2018.CODATA2018'> name='Reduced Planck constant' value=1.0545718176461565e-34 uncertainty=0.0 unit='J s' reference='CODATA 2018'>
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Access units with symbol. Combine with values or
numpy
objects to form quantities:>>> nat.m Unit("m") >>> nat.m / nat.s Unit("m / s") >>> 500 * nat.MeV <Quantity 500. MeV>
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Specify base of natural units with
natpy.set_active_units()
. Pass a string corresponding to a list of default natural units, or a list of physical constants to set your own. The list of default bases may be found innatpy/default_values.py
. -
Run
natpy.convert()
to convert between units, including necessary factors of natural units. Pass just unit objects to obtain conversion factors. Pass quantity objects to perform conversions. E.g.>>> import natpy as nat # kg to keV >>> nat.convert(nat.kg, nat.keV) 5.6173581670146864e+32 # Electron mass >>> me = nat.convert(9.11e-31 * nat.kg, nat.keV) >>> me <Quantity 511.74132902 keV> # Energy of electron with momentum of 1 MeV >>> p = 1 * nat.MeV >>> E = np.sqrt(p**2 + me**2) # Convert to SI units >>> nat.convert(E, nat.J) <Quantity 1.79926309e-13 J>
Note: Summing quantities of compatible units results in a quantity with the first terms units.
-
natpy.convert()
may also be accessed as a method for unit or quantity objects.>>> import natpy as nat >>> nat.GeV.convert( nat.fm**(-1) ) 5.067730716156395 >>> (1 * nat.GeV).convert( nat.fm**(-1) ) <Quantity 5.06773072 1 / fm>
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See
examples/conversion.py
for more examples.
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