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from periodictable import elements
def test():
assert elements.Cm.density == 13.51
assert elements.Cm.density_caveat == "calculated"
assert elements.Cm.density_units == "g/cm^3"
assert elements.D.density == elements.H.density * elements.D.mass/elements.H.mass
# check number density and unit cell width
assert abs(elements.Ca.interatomic_distance - 3.5016640712645786) < 1e-10
assert abs(elements.Fe.number_density - 8.491062108378546e+22) < 1e12
assert elements.Ca.interatomic_distance_units == "angstrom"
assert elements.Fe.number_density_units == "1/cm^3"
#elements.list('symbol','density','density_caveat', format="%3s %10s %s")
#import mass
#mass.init()
#elements.list('symbol','interatomic_distance')
if __name__ == "__main__": test()
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