ry.py

from qiskit import QuantumCircuit, execute, Aer
from qiskit.visualization import plot_histogram

# Create a quantum circuit with one qubit
qc = QuantumCircuit(1)

# YOUR CODE GOES HERE
qc.ry(pi/2, 0)

# measure the qubit
qc.measure_all()

# Tell Qiskit how to simulate our circuit
backend = Aer.get_backend('qasm_simulator') 

# Do the simulation, returning the result
result = execute(qc,backend, shots=1000).result()

# get the probability distribution
counts = result.get_counts()

# Show the histogram
plot_histogram(counts)