def to_index(ind):
""" Returns a quantum number index after checking it
If the index is bad, raises an IndexError
Input:
ind:
Quantum number (Index or str)
Output:
An index
"""
if isinstance(ind, str):
ind = ind.encode("ascii")
ind = lib.string2quantumnumbersindex(ind)
else:
ind = int(ind)
if ind >= 0 and ind < lib.sizeQuantumNumbers():
return ind
else:
raise IndexError("Out of bounds")
def size(self):
""" Number of defined quantum numbers (constexpr Index) """
return lib.sizeQuantumNumbers()