fix the broken linters

src/sage/combinat/crystals/key_crystals.py

@@ -28,6 +28,7 @@
 from sage.misc.cachefunc import cached_method
 from collections.abc import Sequence
 
+
 class KeyTableau(ClonableArray):
     r"""
     A key tableau.
@@ -53,19 +54,16 @@ def check(self):
 
     def _repr_(self):
         r"""
-        EXAMPLES::
+        Return a string representation.
         """
         return repr([list(row) for row in self])
 
     def _repr_diagram(self):
         r"""
         Return a string representation of the diagram of ``self``.
-
-        EXAMPLES::
         """
         if not self:
             return '0'
-        ret = ""
         width = max(len(repr(val)) for row in self for val in row)
         base = f"{{:^{width}}}"
         return "\n".join("|" + " ".join(base.format(val) for val in row)
@@ -83,8 +81,6 @@ def _latex_(self):
     def _ascii_art_(self):
         r"""
         Return an ascii art representation of ``self``.
-
-        EXAMPLES::
         """
         from sage.typeset.ascii_art import AsciiArt
         return AsciiArt(self._repr_diagram().splitlines())
@@ -103,7 +99,7 @@ def _unicode_art_(self):
         vl = unicodedata.lookup('BOX DRAWINGS LIGHT VERTICAL AND LEFT')
         table = [[None]*(self.cols-len(row)) + row for row in reversed(self)]
         ret = []
-        for i,row in enumerate(ascii_art_table(table, use_unicode=True).splitlines()):
+        for i, row in enumerate(ascii_art_table(table, use_unicode=True).splitlines()):
             if row[-1] == " ":
                 if i % 2 == 0:
                     ret.append(row[:-1] + vl)
@@ -164,8 +160,6 @@ def e(self, i, by_tableau=False):
         r"""
         Return the application of the Kashiwara raising operator
         `e_i` on ``self``.
-
-        EXAMPLES::
         """
         P = self.parent()
         n = P._cartan_type.rank()
@@ -219,8 +213,6 @@ def f(self, i, by_tableau=False):
         r"""
         Return the application of the Kashiwara lowering operator
         `f_i` on ``self``.
-
-        EXAMPLES::
         """
         P = self.parent()
         n = P._cartan_type.rank()
@@ -250,7 +242,6 @@ def f(self, i, by_tableau=False):
         data = tuple(map(tuple, data))
         return P.element_class(P, data, check=False)
 
-
 # f_1
 # 1
 # 55511
@@ -294,11 +285,11 @@ def weight(self, root_lattice=False):
             -2*alpha[0] - 3*alpha[1] - 5*alpha[2] - 3*alpha[3]
         """
         P = self.parent().weight_lattice_realization()
-        wt = [P.base_ring().zero()] * len(L.basis())
+        wt = [P.base_ring().zero()] * len(P.basis())
         for row in self:
             for val in row:
                 wt[val-1] += 1
-        return L.from_vector(wt, coerce=False)
+        return P.from_vector(wt, coerce=False)
 
     def epsilon(self, i):
         r"""
@@ -515,7 +506,7 @@ def from_tableau(self, T):
         n = self._cartan_type.rank() + 2
         T = ([n - val for val in col] for col in reversed(T.conjugate()))
 
-        for j in range(self._width-1,-1,-1):
+        for j in range(self._width-1, -1, -1):
             col = next(T)
             for ind, row in enumerate(data):
                 if len(row) <= j:
@@ -525,7 +516,7 @@ def from_tableau(self, T):
                     row[j] = col.pop()
                 else:
                     # Necessarily there is an entry to the right
-                    for i in range(len(col)-1,-1,-1):
+                    for i in range(len(col)-1, -1, -1):
                         if col[i] >= row[j+1]:
                             row[j] = col.pop(i)
                             break
@@ -544,4 +535,4 @@ def shape(self):
         """
         Return the shape of ``self``.
         """
-        return self._shape
+        return self._shape

src/sage/schemes/elliptic_curves/cm.py

@@ -248,7 +248,7 @@ def is_HCP(f, check_monic_irreducible=True):
     # Guarantees 4*p > |D| for fundamental D under GRH
     p = pmin-1
     n = 0
-    from sage.arith.all import next_prime
+    from sage.arith.misc import next_prime
     while True:
         p = next_prime(p)
         n += 1
@@ -315,7 +315,7 @@ def OrderClassNumber(D0,h0,f):
         return h0
     ps = f.prime_divisors()
     from sage.misc.misc_c import prod
-    from sage.arith.all import kronecker_symbol
+    from sage.arith.misc import kronecker as kronecker_symbol
     n = (f // prod(ps)) * prod(p-kronecker_symbol(D0,p) for p in ps)
     if D0 == -3:
         #assert h0 == 1 and n%3==0