diff --git a/mypy/messages.py b/mypy/messages.py
index 1957a5238eab..f5647190b472 100644
--- a/mypy/messages.py
+++ b/mypy/messages.py
@@ -428,9 +428,6 @@ def has_no_attr(
                     matches.extend(best_matches(member, alternatives)[:3])
                     if member == "__aiter__" and matches == ["__iter__"]:
                         matches = []  # Avoid misleading suggestion
-                    if member == "__div__" and matches == ["__truediv__"]:
-                        # TODO: Handle differences in division between Python 2 and 3 more cleanly
-                        matches = []
                     if matches:
                         self.fail(
                             '{} has no attribute "{}"; maybe {}?{}'.format(
@@ -579,12 +576,6 @@ def incompatible_argument(
                             )
                         return codes.OPERATOR
 
-            if name.startswith('"__cmp__" of'):
-                self.unsupported_operand_types(
-                    "comparison", arg_type, base, context, code=codes.OPERATOR
-                )
-                return codes.INDEX
-
             if name.startswith('"__getitem__" of'):
                 self.invalid_index_type(
                     arg_type, callee.arg_types[n - 1], base, context, code=codes.INDEX
diff --git a/mypy/operators.py b/mypy/operators.py
index 0bb8bd6c998c..b546ede36d06 100644
--- a/mypy/operators.py
+++ b/mypy/operators.py
@@ -28,7 +28,6 @@
 }
 
 op_methods_to_symbols: Final = {v: k for (k, v) in op_methods.items()}
-op_methods_to_symbols["__div__"] = "/"
 
 ops_falling_back_to_cmp: Final = {"__ne__", "__eq__", "__lt__", "__le__", "__gt__", "__ge__"}
 
@@ -83,7 +82,6 @@
     "__add__",
     "__sub__",
     "__mul__",
-    "__div__",
     "__truediv__",
     "__mod__",
     "__divmod__",
diff --git a/mypy/plugins/attrs.py b/mypy/plugins/attrs.py
index ff4eb02c389a..60098cc95201 100644
--- a/mypy/plugins/attrs.py
+++ b/mypy/plugins/attrs.py
@@ -274,8 +274,8 @@ def attr_class_maker_callback(
 
     At a quick glance, the decorator searches the class body for assignments of `attr.ib`s (or
     annotated variables if auto_attribs=True), then depending on how the decorator is called,
-    it will add an __init__ or all the __cmp__ methods.  For frozen=True it will turn the attrs
-    into properties.
+    it will add an __init__ or all the compare methods.
+    For frozen=True it will turn the attrs into properties.
 
     See http://www.attrs.org/en/stable/how-does-it-work.html for information on how attrs works.
 
diff --git a/mypy/sharedparse.py b/mypy/sharedparse.py
index a705cf7921b0..31135d5c0049 100644
--- a/mypy/sharedparse.py
+++ b/mypy/sharedparse.py
@@ -29,7 +29,6 @@
     "__long__",
     "__neg__",
     "__new__",
-    "__nonzero__",
     "__oct__",
     "__pos__",
     "__repr__",
@@ -37,7 +36,6 @@
     "__setattr__",
     "__setitem__",
     "__str__",
-    "__unicode__",
 }
 
 MAGIC_METHODS_ALLOWING_KWARGS: Final = {
@@ -51,9 +49,7 @@
 BINARY_MAGIC_METHODS: Final = {
     "__add__",
     "__and__",
-    "__cmp__",
     "__divmod__",
-    "__div__",
     "__eq__",
     "__floordiv__",
     "__ge__",