Official documentation: http://docs.astropy.org/en/stable/
Quantities (astropy.units.quantity) are the combination of a value (integer, float, ...) and a unit (astropy.units).
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from astropy import units as u
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1.85 * u.meter
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500. * u.gram
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400. * u.hertz
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q = 2000. * u.meter
type(q)
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[1., 2., 3.] * u.meter
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import numpy as np
np.array([1., 2., 3.]) * u.meter