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"""Implements the SpeciesReference class."""
class SpeciesReference:
"""Comprised of a species identifier and the stoichiometry.
The stoichiometry is the multiplicity of the species in the reaction."""
def __init__(self, species, stoichiometry):
"""
Construct from the species identifier and the stoichiometry.
>>> from SpeciesReference import SpeciesReference
>>> x = SpeciesReference('a', 2)
>>> x.species
'a'
>>> x.stoichiometry
2
"""
# The species identifier is a string.
self.species = species
# The stoichiometry is an integer.
self.stoichiometry = stoichiometry
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