[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

src/qibo/models/encodings.py

@@ -879,18 +879,18 @@ def _ehrlich_algorithm(initial_string, return_indices: bool = True):
     Based on the Gray code called Ehrlich algorithm. For more details, please see Ref. [1].
 
     Args:
-        initial_string (ndarray): initial bitstring as an :math:`1`-dimensional array 
+        initial_string (ndarray): initial bitstring as an :math:`1`-dimensional array
             of size :math:`n`. All ones in the bitstring need to be consecutive.
-            For instance, for :math:`n = 6` and :math:`k = 2`, the bistrings 
+            For instance, for :math:`n = 6` and :math:`k = 2`, the bistrings
             :math:`000011` and :math:`001100` are examples of acceptable inputs.
-            In contrast, :math:`001001` is not an acceptable input. 
-        return_indices (bool, optional): if ``True``, returns the list of indices of 
-            qubits that act like controls and targets of the circuit to be created. 
+            In contrast, :math:`001001` is not an acceptable input.
+        return_indices (bool, optional): if ``True``, returns the list of indices of
+            qubits that act like controls and targets of the circuit to be created.
             Defaults to ``True``.
 
     Returns:
-        list or tuple(list, list): If ``return_indices=False``, returns list containing 
-        sequence of bistrings in the order generated by the Gray code. 
+        list or tuple(list, list): If ``return_indices=False``, returns list containing
+        sequence of bistrings in the order generated by the Gray code.
         If ``return_indices=True`` returns tuple with the aforementioned list and the list
         of control anf target qubits of gates to be implemented based on the sequence of
         bitstrings.