fix most E301 warnings

Author: fchapoton

src/sage/algebras/free_algebra.py

@@ -420,6 +420,7 @@ class FreeAlgebra_generic(CombinatorialFreeModule, Algebra):
     is a coercion.
     """
     Element = FreeAlgebraElement
+
     def __init__(self, R, n, names):
         """
         The free algebra on `n` generators over a base ring.

src/sage/algebras/lie_conformal_algebras/finitely_freely_generated_lca.py

@@ -73,7 +73,8 @@ def _repr_(self):
             return "Lie conformal algebra generated by {0} over {1}".format(
                 self.gen(0), self.base_ring())
         return "Lie conformal algebra with generators {0} over {1}".format(
-                                                 self.gens(), self.base_ring())
+            self.gens(), self.base_ring())
+
     def _an_element_(self):
         """
         An element of this Lie conformal algebra.

src/sage/categories/category_with_axiom.py

@@ -2764,21 +2764,25 @@ def super_categories(self):
     class FiniteDimensional(CategoryWithAxiom):
         class Finite(CategoryWithAxiom):
             pass
+
         class Unital(CategoryWithAxiom):
             class Commutative(CategoryWithAxiom):
                 pass
 
     class Commutative(CategoryWithAxiom):
         class Facade(CategoryWithAxiom):
             pass
+
         class FiniteDimensional(CategoryWithAxiom):
             pass
+
         class Finite(CategoryWithAxiom):
             pass
 
     class Unital(CategoryWithAxiom):
         pass
 
+
 class TestObjectsOverBaseRing(Category_over_base_ring):
     r"""
     A toy singleton category, for testing purposes.
@@ -2805,15 +2809,18 @@ def super_categories(self):
     class FiniteDimensional(CategoryWithAxiom_over_base_ring):
         class Finite(CategoryWithAxiom_over_base_ring):
             pass
+
         class Unital(CategoryWithAxiom_over_base_ring):
             class Commutative(CategoryWithAxiom_over_base_ring):
                 pass
 
     class Commutative(CategoryWithAxiom_over_base_ring):
         class Facade(CategoryWithAxiom_over_base_ring):
             pass
+
         class FiniteDimensional(CategoryWithAxiom_over_base_ring):
             pass
+
         class Finite(CategoryWithAxiom_over_base_ring):
             pass
 

src/sage/categories/examples/sets_cat.py

@@ -539,6 +539,7 @@ def _from_integer_(self, e):
         return self.element_class(self, Integer(e))
 
     from sage.structure.element_wrapper import ElementWrapper
+
     class Element (ElementWrapper, PrimeNumbers_Abstract.Element):
         def _integer_(self, IntRing):
             """

src/sage/categories/finitely_generated_lambda_bracket_algebras.py

@@ -31,6 +31,7 @@ class FinitelyGeneratedLambdaBracketAlgebras(CategoryWithAxiom_over_base_ring):
         Category of finitely generated lambda bracket algebras over Algebraic Field
     """
     _base_category_class_and_axiom = (LambdaBracketAlgebras, "FinitelyGeneratedAsLambdaBracketAlgebra")
+
     class ParentMethods:
         def ngens(self):
             r"""

src/sage/categories/lambda_bracket_algebras.py

@@ -126,6 +126,7 @@ def ideal(self, *gens, **kwds):
             """
             raise NotImplementedError("ideals of Lie Conformal algebras are "
                                       "not implemented yet")
+
     class ElementMethods:
 
         @coerce_binop

src/sage/coding/golay_code.py

@@ -118,7 +118,7 @@ def __eq__(self, other):
         """
         return isinstance(other, GolayCode) \
                 and self.base_field() == other.base_field() \
-                and self.length() == other.length() \
+                and self.length() == other.length()
 
     def _repr_(self):
         r"""
@@ -133,8 +133,8 @@ def _repr_(self):
         ext = ""
         if n % 2 == 0:
             ext = "Extended"
-        return "[%s, %s, %s] %s Golay code over GF(%s)"\
-                % (n, self.dimension(), self.minimum_distance(), ext, self.base_field().cardinality())
+        return "[%s, %s, %s] %s Golay code over GF(%s)" % (n, self.dimension(),
+            self.minimum_distance(), ext, self.base_field().cardinality())
 
     def _latex_(self):
         r"""

src/sage/coding/goppa_code.py

@@ -139,7 +139,9 @@ def _repr_(self):
             [8, 2] Goppa code over GF(2)
         """
         return "[{}, {}] Goppa code over GF({})".format(
-                self.length(), self.dimension(), self.base_field().cardinality())
+            self.length(), self.dimension(),
+            self.base_field().cardinality())
+
     def _latex_(self):
         r"""
         Return a latex representation of ``self``.

src/sage/crypto/mq/sr.py

@@ -3301,6 +3301,7 @@ def __init__(self, sr):
             a^2 + a
         """
         self.sr = sr
+
     def __enter__(self):
         """
         EXAMPLES::
@@ -3318,6 +3319,7 @@ def __enter__(self):
         """
         self.allow_zero_inversions = self.sr._allow_zero_inversions
         self.sr._allow_zero_inversions = True
+
     def __exit__(self, typ, value, tb):
         """
         EXAMPLES::

src/sage/databases/findstat.py

@@ -4738,6 +4738,7 @@ def __init__(self):
 #                fields = "SageCodeElementToString,SageCodeElementsOnLevel,SageCodeStringToElement"
 #                url = FINDSTAT_API_COLLECTIONS + id + "?fields=" + fields
 #                print(json.load(urlopen(url))["included"]["Collections"][id])
+
         def position(item):
             try:
                 return tuple(_SupportedFindStatCollections).index(item[1]["NameWiki"])