suggested fixes done

Author: fchapoton

src/sage/combinat/fully_packed_loop.py

@@ -1407,11 +1407,11 @@ def cardinality(self):
 
         EXAMPLES::
 
-            sage: [AlternatingSignMatrices(n).cardinality() for n in range(11)]
-            [1, 1, 2, 7, 42, 429, 7436, 218348, 10850216, 911835460, 129534272700]
+            sage: [AlternatingSignMatrices(n).cardinality() for n in range(10)]
+            [1, 1, 2, 7, 42, 429, 7436, 218348, 10850216, 911835460]
         """
-        return Integer(prod([factorial(3*k+1)/factorial(self._n+k)
-                       for k in range(self._n)]))
+        return Integer(prod(factorial(3 * k + 1) / factorial(self._n + k)
+                            for k in range(self._n)))
 
     def _an_element_(self):
         """

src/sage/combinat/posets/incidence_algebras.py

@@ -425,7 +425,8 @@ def __invert__(self):
                 raise ValueError("element is not invertible")
             inv = ~M
             L = self.parent()._linear_extension
-            return self.parent().sum_of_terms(((L[i], L[j]), inv[i, j])
+            return self.parent().sum_of_terms(
+                ((L[i], L[j]), inv[i, j])
                 for i, j in inv.nonzero_positions(copy=False))
 
 

src/sage/combinat/ribbon_shaped_tableau.py

@@ -112,7 +112,7 @@ def __init__(self, parent, t):
             sage: TestSuite(R).run()
         """
         if not isinstance(t, SkewTableau):
-            # scrubing None
+            # scrubbing None
             t = [[i for i in row if i is not None] for row in t]
 
             st = []

src/sage/combinat/subsets_hereditary.py

@@ -127,7 +127,7 @@ def subsets_with_hereditary_property(f, X, max_obstruction_size=None, ncpus=1):
 
     def explore_neighbors(s):
         r"""
-        Explores the successors of a set s.
+        Explore the successors of a set s.
 
         The successors of a set s are all the sets s+[i] where max(s)<i. This
         function returns them all as a partition `(yes_sets,no_sets)`.