Merge pull request #42 from dlyongemallo/status

Add status badges to README.md.

README.md

@@ -2,6 +2,11 @@
 
 A transpiler pass for Qiskit which uses ZX-Calculus for circuit optimization, implemented using PyZX.
 
+[![License](https://img.shields.io/github/license/dlyongemallo/qiskit-zx-transpiler.svg)](https://opensource.org/licenses/Apache-2.0)
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/qiskit-zx-transpiler)]()
+[![PyPI - Package Version](https://badge.fury.io/py/qiskit-zx-transpiler.svg)](https://badge.fury.io/py/qiskit-zx-transpiler)
+[![CI Status](https://github.com/dlyongemallo/qiskit-zx-transpiler/actions/workflows/test.yml/badge.svg)](https://github.com/dlyongemallo/qiskit-zx-transpiler/actions/workflows/test.yml)
+
 ## Example usage
 
 ```python

zxpass/zxpass.py

@@ -160,7 +160,7 @@ def _dag_to_circuits_and_nodes(self, dag: DAGCircuit) -> List[Union[zx.Circuit,
         return circuits_and_nodes
 
     def _recover_dag(self, circuits_and_nodes: List[Union[zx.Circuit, DAGOpNode]]) -> DAGCircuit:
-        """Recovers a DAG from a list of a pyzx Circuits and DAGOpNodes
+        """Recover a DAG from a list of a pyzx Circuits and DAGOpNodes.
 
         :param circuits_and_nodes: The list of (optimized) PyZX Circuits and DAGOpNodes from which to recover the DAG.
         :return: An optimized version of the original input DAG to ZXPass.
@@ -171,11 +171,11 @@ def _recover_dag(self, circuits_and_nodes: List[Union[zx.Circuit, DAGOpNode]]) -
         dag.add_clbits(self.clbits)
         dag.qregs = self.qregs
         dag.add_qubits(self.qubits)
-        for circuit in circuits_and_nodes:
-            if isinstance(circuit, DAGOpNode):
-                dag.apply_operation_back(circuit.op, circuit.qargs, circuit.cargs)
+        for circuit_or_node in circuits_and_nodes:
+            if isinstance(circuit_or_node, DAGOpNode):
+                dag.apply_operation_back(circuit_or_node.op, circuit_or_node.qargs, circuit_or_node.cargs)
                 continue
-            for gate in circuit.gates:
+            for gate in circuit_or_node.gates:
                 gate_name = gate.qasm_name if not (hasattr(gate, 'adjoint') and gate.adjoint) \
                     else gate.qasm_name_adjoint
                 if gate_name not in qiskit_gate_table:
@@ -195,8 +195,7 @@ def _recover_dag(self, circuits_and_nodes: List[Union[zx.Circuit, DAGOpNode]]) -
         return dag
 
     def run(self, dag: DAGCircuit) -> DAGCircuit:
-        """
-        Run the ZX transpiler pass on the given DAG.
+        """Run the ZX transpiler pass on the given DAG.
 
         :param dag: The directed acyclic graph to optimize using pyzx.
         :return: The transformed DAG.