Plus-i state $\lvert i\rangle$ implementation using Qiskit. The $\lvert i\rangle$ state is prepared by applying a Hadamard gate followed by an S gate to $\lvert 0\rangle$.

from qiskit import QuantumCircuit
from qiskit.quantum_info import Statevector
 
qc = QuantumCircuit(1)
qc.h(0)  # |0> -> |+>
qc.s(0)  # |+> -> |i> = (|0> + i|1>) / sqrt(2)
print(Statevector(qc))
# Statevector([0.70710678+0.j, 0.+0.70710678j], dims=(2,))