code: def E_nl(n, l, hw):
      """
      Returns the Energy of an isotropic harmonic oscillator.
  
      Parameters
      ==========
  
      n :
          The "nodal" quantum number.
      l :
          The orbital angular momentum.
      hw :
          The harmonic oscillator parameter.
  
      Notes
      =====
  
      The unit of the returned value matches the unit of hw, since the energy is
      calculated as:
  
          E_nl = (2*n + l + 3/2)*hw
  
      Examples
      ========
  
      >>> from sympy.physics.sho import E_nl
      >>> from sympy import symbols
      >>> x, y, z = symbols('x, y, z')
      >>> E_nl(x, y, z)
      z*(2*x + y + 3/2)
      """
      return (2 * n + l + Rational(3, 2)) * hw
  
imports: from sympy.core import S, pi, Rational
  from sympy.functions import assoc_laguerre, sqrt, exp, factorial, factorial2
label_desc: Use image node_id 2 for calling a global function with example usage: E_nl(n, l, hw) and returns: unknown