gh-36147: Fixing many e305
    
This is fixing many `E305` warnings in `py` files

`E305 expected 2 blank lines after class or function definition, found
1`

### 📝 Checklist

- [x] The title is concise, informative, and self-explanatory.
- [x] The description explains in detail what this PR is about.
    
URL: #36147
Reported by: Frédéric Chapoton
Reviewer(s): Kwankyu Lee

Author: Release Manager

src/sage/algebras/free_algebra.py

@@ -331,6 +331,7 @@ def create_object(self, version, key):
             return FreeAlgebra_letterplace(key[1], degrees=key[0])
         return FreeAlgebra_generic(key[0], len(key[1]), key[1])
 
+
 FreeAlgebra = FreeAlgebraFactory('FreeAlgebra')
 
 

src/sage/algebras/group_algebra.py

@@ -223,5 +223,6 @@ def _coerce_map_from_(self, S):
                 return SetMorphism(S.Hom(self, category=self.category() | S.category()),
                                    lambda x: self.sum_of_terms( (hom_G(g), hom_K(c)) for g,c in x ))
 
+
 from sage.misc.persist import register_unpickle_override
 register_unpickle_override('sage.algebras.group_algebras', 'GroupAlgebra',  GroupAlgebra_class)

src/sage/categories/cartesian_product.py

@@ -271,6 +271,7 @@ def base_ring(self):
         """
         return self.base_category().base_ring()
 
+
 # Moved to avoid circular imports
 lazy_import('sage.categories.sets_cat', 'cartesian_product')
 """

src/sage/categories/category_with_axiom.py

@@ -2524,6 +2524,7 @@ def __init__(self, base_category):
 class CategoryWithAxiom_singleton(Category_singleton, CategoryWithAxiom):#, Category_singleton, FastHashable_class):
     pass
 
+
 """
 The following workaround is needed until any :class:`CategoryWithAxiom` of a
 :class:`Category_over_base_ring` becomes automatically a

src/sage/categories/examples/algebras_with_basis.py

@@ -97,4 +97,5 @@ def algebra_generators(self):
         # for the specifying the order of the elements in the family
         #return Family(self._alphabet, lambda a: self.term(self.basis().keys()(a)))
 
+
 Example = FreeAlgebra

src/sage/categories/examples/commutative_additive_semigroups.py

@@ -194,4 +194,5 @@ def __hash__(self):
             """
             return hash(tuple(self.value.items()))
 
+
 Example = FreeCommutativeAdditiveSemigroup

src/sage/categories/examples/cw_complexes.py

@@ -158,4 +158,5 @@ def dimension(self):
             """
             return self._dim
 
+
 Example = Surface

src/sage/categories/examples/filtered_algebras_with_basis.py

@@ -198,4 +198,5 @@ def product_on_basis(self, s, t):
             cur = cur * self.monomial(self._indices.gen(a))
         return cur
 
+
 Example = PBWBasisCrossProduct

src/sage/categories/examples/filtered_modules_with_basis.py

@@ -149,4 +149,5 @@ def _repr_term(self, t):
         """
         return 'P' + t._repr_()
 
+
 Example = FilteredPartitionModule

src/sage/categories/examples/finite_dimensional_algebras_with_basis.py

@@ -143,4 +143,5 @@ def _repr_term(self, p):
         """
         return str(p)
 
+
 Example = KroneckerQuiverPathAlgebra