[Python] PYTHON: Qiskit library import

I'm trying to implement old code on qiskit whose imports start with

from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit
from qiskit import BasicAer, execute
from qiskit.tools.visualization import plot_histogram
from qiskit.tools.monitor import job_monitor
from qiskit.providers.ibmq import least_busy
import cmath


the error comes from the 2nd line

ImportError: cannot import name 'BasicAer' from 'qiskit' (/usr/local/lib/python3.10/dist-packages/qiskit/init.py)
​

I think the problem comes from an old version of qiskit but when I try an old version I have a problem with self "cannot import name 'Self' from 'typing_extensions'."

Someone would have any idea ? ty

I don't have the exact qiskit version of the code I'm trying to implement but the code dates from August 2019

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