code: def grover_iteration(qstate, oracle):
      """Applies one application of the Oracle and W Gate, WV.
  
      Parameters
      ==========
  
      qstate : Qubit
          A superposition of qubits.
      oracle : OracleGate
          The black box operator that flips the sign of the desired basis qubits.
  
      Returns
      =======
  
      Qubit : The qubits after applying the Oracle and W gate.
  
      Examples
      ========
  
      Perform one iteration of grover's algorithm to see a phase change::
  
          >>> from sympy.physics.quantum.qapply import qapply
          >>> from sympy.physics.quantum.qubit import IntQubit
          >>> from sympy.physics.quantum.grover import OracleGate
          >>> from sympy.physics.quantum.grover import superposition_basis
          >>> from sympy.physics.quantum.grover import grover_iteration
          >>> numqubits = 2
          >>> basis_states = superposition_basis(numqubits)
          >>> f = lambda qubits: qubits == IntQubit(2)
          >>> v = OracleGate(numqubits, f)
          >>> qapply(grover_iteration(basis_states, v))
          |2>
  
      """
      wgate = WGate(oracle.nqubits)
      return wgate * oracle * qstate
  
imports: from sympy.core.numbers import pi
  from sympy.core.sympify import sympify
  from sympy.core.basic import Atom
  from sympy.functions.elementary.integers import floor
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.matrices.dense import eye
  from sympy.core.numbers import NegativeOne
  from sympy.physics.quantum.qapply import qapply
  from sympy.physics.quantum.qexpr import QuantumError
  from sympy.physics.quantum.hilbert import ComplexSpace
  from sympy.physics.quantum.operator import UnitaryOperator
  from sympy.physics.quantum.gate import Gate
  from sympy.physics.quantum.qubit import IntQubit
label_desc: Use image node_id 2 for calling a global function with example usage: grover_iteration(qstate, oracle) and returns: unknown