Actually, hbar also works if you import it (and this makes more sense than
importing the class):
from sympy.physics.quantum.constants import hbar
and then ...subs(hbar, 1).
HBar is a class name, but the module also creates an instance of that
class, called hbar.
On Tuesday, December 26,
hbar is a special constant; you refer to it as HBar(), not as hbar, and it
needs to be imported first. This is how you can replace it in an
expression:
from sympy import *
from sympy.physics.qho_1d import psi_n
from sympy.physics.quantum.constants import HBar
n, x, m, omega = symbols("n x m
