from qiskit import pulse # Create a pulse schedule schedule = pulse.Schedule() # Add two pulses to the schedule pulse1 = pulse.ConstantPulse(0.1, 1) pulse2 = pulse.ConstantPulse(0.2, 1) schedule += pulse1 schedule += pulse2 # Insert a new pulse into the schedule new_pulse = pulse.ConstantPulse(0.3, 1) schedule.insert(1, new_pulse)In the code example above, we create a schedule, add two constant pulses to the schedule, and then insert a new constant pulse with a duration of 0.3 into the schedule at index 1. The insert function takes two arguments: the index at which to insert the new pulse, and the pulse instruction to insert. The package library used in this code example is the qiskit.pulse package, which provides pulse-level control over quantum states.