Trac #33350: remove traces of six

URL: https://trac.sagemath.org/33350
Reported by: chapoton
Ticket author(s): Frédéric Chapoton
Reviewer(s): Tobias Diez

src/sage/combinat/recognizable_series.py

@@ -934,7 +934,6 @@ def minimized(self):
         EXAMPLES::
 
             sage: from itertools import islice
-            sage: from six.moves import zip
             sage: Rec = RecognizableSeriesSpace(ZZ, [0, 1])
 
             sage: S = Rec((Matrix([[3, 6], [0, 1]]), Matrix([[0, -6], [1, 5]])),

src/sage/crypto/sbox.pyx

@@ -7,8 +7,6 @@ from cysignals.memory cimport check_allocarray, sig_free
 from sage.structure.sage_object cimport SageObject
 from sage.structure.element cimport Element
 
-from six import integer_types
-
 from sage.combinat.integer_vector import IntegerVectors
 from sage.crypto.boolean_function import BooleanFunction
 from sage.crypto.boolean_function cimport hamming_weight, walsh_hadamard
@@ -432,12 +430,10 @@ cdef class SBox(SageObject):
             TypeError: cannot apply SBox to 1/2
         """
         # Handle integer inputs
-        if type(X) == int:
+        if isinstance(X, int):
             return self._S_list[<int> X]
         if isinstance(X, Integer):
             return self._S_list[<Integer> X]
-        if isinstance(X, integer_types):
-            return self._S_list[ZZ(X)]
 
         # Handle non-integer inputs: vectors, finite field elements to-integer-coercible elements
         #cdef int i

src/sage/manifolds/differentiable/symplectic_form.py

@@ -23,8 +23,7 @@
 #                  https://www.gnu.org/licenses/
 # *****************************************************************************
 from __future__ import annotations
-from six.moves import range
-from typing import Dict, Union, Optional
+from typing import Union, Optional
 
 from sage.symbolic.expression import Expression
 from sage.manifolds.differentiable.diff_form import DiffForm, DiffFormParal
@@ -112,7 +111,7 @@ class SymplecticForm(DiffForm):
     _dim_half: int
     _poisson: Optional[PoissonTensorField]
     _vol_form: Optional[DiffForm]
-    _restrictions: Dict[DifferentiableManifold, SymplecticForm]
+    _restrictions: dict[DifferentiableManifold, SymplecticForm]
 
     def __init__(
         self,