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 omega")
psi_n(n, x, m, omega).subs(HBar(), 1)
An attempt to lambdify the complete function psi_n fails because of the
factorial; apparently it's not supported by code generation.
psi = lambdify([n, x, m, omega], psi_n(n, x, m, omega).subs(HBar(), 1)) #
error
But if the parameter n is fixed, you can lambdify the rest:
psi = lambdify([x, m, omega], psi_n(0, x, m, omega).subs(HBar(), 1))
Now psi is callable like psi(1, 2, 3).
>
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