linting

pennylane/fermi/fermionic.py

@@ -326,41 +326,41 @@ def to_mat(self, n_orbitals=None, format="dense", buffer_size=None):
 
  def shift_operator(self, initial_position, final_position):
  r"""Shifts an operator in the FermiWord from ``initial_position`` to ``final_position`` by applying the fermionic anti-commutation relations.
- There are three `anti-commutator relations <https://en.wikipedia.org/wiki/Creation_and_annihilation_operators#Creation_and_annihilation_operators_in_quantum_field_theories>`_:
+  There are three `anti-commutator relations <https://en.wikipedia.org/wiki/Creation_and_annihilation_operators#Creation_and_annihilation_operators_in_quantum_field_theories>`_:
 
- .. math::
- \left\{ a_i, a_j \right\} = 0 \quad \left\{ a^{\dagger}_i, a^{\dagger}_j \right\} = 0 \quad \left\{ a_i, a^{\dagger}_j \right\} = \delta_{ij}
+  .. math::
+  \left\{ a_i, a_j \right\} = 0 \quad \left\{ a^{\dagger}_i, a^{\dagger}_j \right\} = 0 \quad \left\{ a_i, a^{\dagger}_j \right\} = \delta_{ij}
 
 
- where 
+  where
 
- .. math::
- \left\{a_i, a_j \right\} = a_i a_j + a_j a_i,
+  .. math::
+  \left\{a_i, a_j \right\} = a_i a_j + a_j a_i,
 
- and 
+  and
 
- .. math::
- \delta_{ij} = \begin{cases} 1 & i = j \\ 0 & i \neq j \end{cases}.
+  .. math::
+  \delta_{ij} = \begin{cases} 1 & i = j \\ 0 & i \neq j \end{cases}.
 
- Args:
- initial_position (int): The position of the operator to be shifted.
- final_position (int): The desired position of the operator.
+  Args:
+  initial_position (int): The position of the operator to be shifted.
+  final_position (int): The desired position of the operator.
 
- Returns:
- FermiSentence: The ``FermiSentence`` obtained after applying the anti-commutator relations.
+  Returns:
+  FermiSentence: The ``FermiSentence`` obtained after applying the anti-commutator relations.
 
- Raises:
- TypeError: if ``initial_position`` or ``final_position`` is not an integer
- ValueError: if ``initial_position`` or ``final_position`` are outside the range ``[0, len(self) - 1]``
- where ``len(self)`` is the number of operators in the FermiWord.
+  Raises:
+  TypeError: if ``initial_position`` or ``final_position`` is not an integer
+  ValueError: if ``initial_position`` or ``final_position`` are outside the range ``[0, len(self) - 1]``
+  where ``len(self)`` is the number of operators in the FermiWord.
 
 
- **Example**
+  **Example**
 
- >>> w = qml.fermi.FermiWord({(0, 0): '+', (1, 1): '-'})
- >>> w.shift_operator(0, 1)
- -1 * a(1) a⁺(0)
- """
+  >>> w = qml.fermi.FermiWord({(0, 0): '+', (1, 1): '-'})
+  >>> w.shift_operator(0, 1)
+  -1 * a(1) a⁺(0)
+  """
 
  if not isinstance(initial_position, int) or not isinstance(final_position, int):
  raise TypeError("Positions must be integers.")