Returns the number of qubits, qudits, or qids val operates on.
cirq.num_qubits(
val: Any, default: TDefault = RaiseTypeErrorIfNotProvidedInt
) -> Union[int, TDefault]
Used in the notebooks
Args |
|---|
val
|
The value to get the number of qubits from.
|
default
|
Determines the fallback behavior when val doesn't have
a number of qubits. If default is not set, a TypeError is raised.
If default is set to a value, that value is returned.
|
Returns |
|---|
If val has a _num_qubits_ method and its result is not
NotImplemented, that result is returned. Otherwise, if val has a
_qid_shape_ method, the number of qubits is computed from the length
of the shape and returned e.g. len(shape). If neither method returns a
value other than NotImplemented and a default value was specified, the
default value is returned.
|
Raises |
|---|
TypeError
|
val doesn't have either a _num_qubits_ or a _qid_shape_
method (or they returned NotImplemented) and also no default value
was specified.
|
View source on GitHub