def parse_list(t, p):
"""Takes a nested list that represents a chemical formula (returned by the function make_list()), makes an analogous list of atoms, and numbers the atoms in order.
t: list of str
p: Parser object
Returns: list of Atoms
"""
res = []
for elem in t:
if type(elem) == str:
#res.append(elem + str(i)) #appends string
if elem == 'C':
res.append(Atom.Carbon(elem + str(p.i))) #appends atom
if elem == 'N':
res.append(Atom.Nitrogen(elem + str(p.i))) #appends atom
if elem == 'O':
res.append(Atom.Oxygen(elem + str(p.i))) #appends atom
if elem == 'P':
res.append(Atom.Phosphorus(elem + str(p.i))) #appends atom
if elem == 'S':
res.append(Atom.Sulfur(elem + str(p.i))) #appends atom
p.incr()
if type(elem) == list:
res.append(parse_list(elem, p))
return res
