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How to transform the U3 gate of parameters (theta, phi, lambda) to an Operator. (in qiskit) The following code don't work

theta = Parameter('theta')
phi   = Parameter('phi')
lamb  = Parameter('lam')

UO=Operator(UGate(theta,phi,lamb))
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You can use CircuitOp from Qiskit's Operator Flow:

from qiskit.opflow import CircuitOp

UO = CircuitOp(UGate(theta, phi, lamb))

You can use assign_parameters() method for parameter binding:

import numpy as np
op = UO.assign_parameters({theta: np.pi / 2, phi: 0, lamb: np.pi})

from qiskit.visualization import array_to_latex
array_to_latex(op.to_matrix())
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