Coverage for chemreac/constants : 100%

# -*- coding: utf-8 -*- 

import quantities as pq 

from .units import to_unitless, get_derived_unit 

Faraday_constant = pq.constants.Faraday_constant 

vacuum_permittivity = pq.constants.vacuum_permittivity 

Avogadro_constant = pq.constants.Avogadro_constant.rescale(1/pq.mol) 

Boltzmann_constant = pq.constants.Boltzmann_constant 

elementary_charge = pq.constants.elementary_charge 

def get_unitless_constant(registry, name): 

    named_const = { 

        'Faraday_constant': Faraday_constant, 

        'vacuum_permittivity': vacuum_permittivity, 

    } 

    if registry is None: 

        return float(named_const[name].definition) 

    named_const_units = { 

        'Faraday_constant': (get_derived_unit(registry, 'charge') / 

                             get_derived_unit(registry, 'amount')), 

        'vacuum_permittivity': get_derived_unit(registry, 'permittivity') 

    } 

    return to_unitless(named_const[name], named_const_units[name])