Remove copy and deepcopy

TODO: add FlatsMatroid copy tests in matroid.pyx after #37670

Author: gmou3

src/sage/matroids/advanced.py

@@ -15,6 +15,7 @@
         - :class:`RankMatroid <sage.matroids.rank_matroid.RankMatroid>`
         - :class:`CircuitClosuresMatroid <sage.matroids.circuit_closures_matroid.CircuitClosuresMatroid>`
         - :class:`BasisMatroid <sage.matroids.basis_matroid.BasisMatroid>`
+        - :class:`FlatsMatroid <sage.matroids.flats_matroid.FlatsMatroid>`
         - :class:`LinearMatroid <sage.matroids.linear_matroid.LinearMatroid>`
         - :class:`RegularMatroid <sage.matroids.linear_matroid.RegularMatroid>`
         - :class:`BinaryMatroid <sage.matroids.linear_matroid.BinaryMatroid>`
@@ -54,6 +55,7 @@
 from .rank_matroid import RankMatroid
 from .circuit_closures_matroid import CircuitClosuresMatroid
 from .basis_matroid import BasisMatroid
+from .flats_matroid import FlatsMatroid
 from .linear_matroid import LinearMatroid, RegularMatroid, BinaryMatroid, TernaryMatroid, QuaternaryMatroid
 from .utilities import setprint, newlabel, get_nonisomorphic_matroids, lift_cross_ratios, lift_map
 from . import lean_matrix

src/sage/matroids/flats_matroid.pyx

@@ -272,42 +272,6 @@ cdef class FlatsMatroid(Matroid):
 
     # copying, loading, saving
 
-    def __copy__(self):
-        """
-        Create a shallow copy.
-
-        EXAMPLES::
-
-            sage: from sage.matroids.flats_matroid import FlatsMatroid
-            sage: M = FlatsMatroid(matroids.catalog.Vamos())
-            sage: N = copy(M)  # indirect doctest
-            sage: M == N
-            True
-            sage: M.groundset() is N.groundset()
-            True
-        """
-        return self
-
-    def __deepcopy__(self, memo=None):
-        """
-        Create a deep copy.
-
-        .. NOTE::
-
-            Since matroids are immutable, a shallow copy normally suffices.
-
-        EXAMPLES::
-
-            sage: from sage.matroids.flats_matroid import FlatsMatroid
-            sage: M = FlatsMatroid(matroids.catalog.Vamos())
-            sage: N = deepcopy(M)  # indirect doctest
-            sage: M == N
-            True
-            sage: M.groundset() is N.groundset()
-            True
-        """
-        return self
-
     def __reduce__(self):
         """
         Save the matroid for later reloading.