qml.ops.qubit.attributes.Attribute¶

class
Attribute
[source]¶ Bases:
set
Class to represent a set of operators with a certain attribute.
Example
Suppose we would like to store a list of which qubit operations are Pauli operators. We can create a new
Attribute
,pauli_ops
, like so, listing which operations satisfy this property.>>> pauli_ops = Attribute(["PauliX", "PauliZ"])
We can check either a string or an Operation for inclusion in this set:
>>> qml.X(0) in pauli_ops True >>> "Hadamard" in pauli_ops False
We can also dynamically add operators to the sets at runtime, by passing either a string, an operation class, or an operation itself. This is useful for adding custom operations to the attributes such as
composable_rotations
andself_inverses
that are used in compilation transforms.>>> pauli_ops.add("PauliY") >>> pauli_ops ["PauliX", "PauliY", "PauliZ"]
Methods
add
(obj)Add an Operator to an attribute.
Remove all elements from this set.
Return a shallow copy of a set.
Return the difference of two or more sets as a new set.
Remove all elements of another set from this set.
Remove an element from a set if it is a member.
Return the intersection of two sets as a new set.
Update a set with the intersection of itself and another.
Return True if two sets have a null intersection.
Report whether another set contains this set.
Report whether this set contains another set.
Remove and return an arbitrary set element.
Remove an element from a set; it must be a member.
Return the symmetric difference of two sets as a new set.
Update a set with the symmetric difference of itself and another.
Return the union of sets as a new set.
Update a set with the union of itself and others.

clear
()¶ Remove all elements from this set.

copy
()¶ Return a shallow copy of a set.

difference
()¶ Return the difference of two or more sets as a new set.
(i.e. all elements that are in this set but not the others.)

difference_update
()¶ Remove all elements of another set from this set.

discard
()¶ Remove an element from a set if it is a member.
If the element is not a member, do nothing.

intersection
()¶ Return the intersection of two sets as a new set.
(i.e. all elements that are in both sets.)

intersection_update
()¶ Update a set with the intersection of itself and another.

isdisjoint
()¶ Return True if two sets have a null intersection.

issubset
()¶ Report whether another set contains this set.

issuperset
()¶ Report whether this set contains another set.

pop
()¶ Remove and return an arbitrary set element. Raises KeyError if the set is empty.

remove
()¶ Remove an element from a set; it must be a member.
If the element is not a member, raise a KeyError.

symmetric_difference
()¶ Return the symmetric difference of two sets as a new set.
(i.e. all elements that are in exactly one of the sets.)

symmetric_difference_update
()¶ Update a set with the symmetric difference of itself and another.

union
()¶ Return the union of sets as a new set.
(i.e. all elements that are in either set.)

update
()¶ Update a set with the union of itself and others.
