transpiling a circuit in Qiskit results is "configuration() missing 1 required positional argument"

Question

I was learing about scheduling. So, to test scheduling for a 2 qubit circuit I tried to run this code but found error

from qiskit.test.mock import FakeAlmaden
from qiskit import QuantumCircuit, transpile

qc2 = QuantumCircuit(2)
backend = FakeAlmaden
new_qc2 = transpile(qc2, backend)
new_qc2.draw()

TypeError: configuration() missing 1 required positional argument: 'self'

Answer 1

Transpile takes a Backend instance, not type. In order words, you are missing the () after FakeAlmaden:

from qiskit.test.mock import FakeAlmaden
from qiskit import QuantumCircuit, transpile

qc2 = QuantumCircuit(2)
backend = FakeAlmaden()
new_qc2 = transpile(qc2, backend)
new_qc2.draw()

Answer 2

I think you have missed a parenthesis while defining the backend. The following code is working fine .
from qiskit.test.mock import FakeAlmaden
qc2 = QuantumCircuit(2)
backend = FakeAlmaden()
new_qc2 = transpile(qc2, backend)
transpiled_qc2.draw()
I see the output to be -