class_docstr: Fock state ket for a fermionic mode.
  
  Parameters
  ==========
  
  n : Number
      The Fock state number.
class_docstr_tok: ["Fock","state","ket","for","a","fermionic","mode",".","Parameters","==========","n",":","Number","The","Fock","state","number","."]
code: def _eval_innerproduct_FermionFockBra(self, bra, **hints):
      return KroneckerDelta(self.n, bra.n)
  
imports: from sympy.core.numbers import Integer
  from sympy.core.singleton import S
  from sympy.physics.quantum import Operator
  from sympy.physics.quantum import HilbertSpace, Ket, Bra
  from sympy.functions.special.tensor_functions import KroneckerDelta
label_desc: Use image node_id 5 for calling the FermionFockKet obj's underlying member method code with example usage: obj._eval_innerproduct_FermionFockBra(bra) and returns: KroneckerDelta