Creating arbitrary qubit by custom rotations

ArbitraryQubit.py

from qiskit import QuantumRegister, ClassicalRegister, QuantumCircuit, execute, Aer
from qiskit.visualization import plot_bloch_multivector
from math import pi

%matplotlib inline

q =  QuantumRegister(1,"q") 
c = ClassicalRegister(1,"c") 
qc = QuantumCircuit(q,c)

# Crating the angle pi/4 = 45 degrees 
theta = pi*(1/4)
qc.ry(theta,q[0])

# Get the state-vector to draw on the bloch sphere.
backend = Aer.get_backend('statevector_simulator') 
result = execute(qc, backend).result()
psi  = result.get_statevector()

display(plot_bloch_multivector(psi))

# Measure the quibit 
qc.measure(q,c)

# Run the circuit again in qasm_simulator to get probability results.
job = execute(qc,Aer.get_backend('qasm_simulator'),shots=1000)
counts = job.result().get_counts(qc)
print(counts)