How to undo an operation in qiskit on jupyter notebook?

Question

I am not able to undo an operation. For example, I want a single Hadamard gate on a single qubit but by mistake two Hadamard gate added. Now I want to remove one of them without interrupting kernel. Is there any easy way. Please help me. Thank you.

Frank · Accepted Answer

To remove the last gate you can do qc.data.pop().
Example:
qc = QuantumCircuit(1)
qc.h(0)
qc.draw('text')

output:
     ┌───┐
q_0: ┤ H ├
     └───┘

Then:
qc.data.pop()
qc.draw('text')

output:
q_0:

How to undo an operation in qiskit on jupyter notebook?

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