Remove python2 logic from server/deps.py (#13267)

Author: sobolevn

mypy/checkstrformat.py

@@ -867,7 +867,7 @@ def build_dict_type(self, expr: FormatStringExpr) -> Type:
             str_type = self.chk.named_generic_type("builtins.str", [])
             return self.chk.named_generic_type("typing.Mapping", [str_type, any_type])
         else:
-            assert False, "There should not be UnicodeExpr on Python 3"
+            assert False, "Unreachable"
 
     def build_replacement_checkers(
         self, specifiers: List[ConversionSpecifier], context: Context, expr: FormatStringExpr

mypy/server/deps.py

@@ -225,7 +225,6 @@ def __init__(
     ) -> None:
         self.scope = Scope()
         self.type_map = type_map
-        self.python2 = python_version[0] == 2
         # This attribute holds a mapping from target to names of type aliases
         # it depends on. These need to be processed specially, since they are
         # only present in expanded form in symbol tables. For example, after:
@@ -603,11 +602,7 @@ def visit_for_stmt(self, o: ForStmt) -> None:
             self.add_attribute_dependency_for_expr(o.expr, "__iter__")
             self.add_attribute_dependency_for_expr(o.expr, "__getitem__")
             if o.inferred_iterator_type:
-                if self.python2:
-                    method = "next"
-                else:
-                    method = "__next__"
-                self.add_attribute_dependency(o.inferred_iterator_type, method)
+                self.add_attribute_dependency(o.inferred_iterator_type, "__next__")
         else:
             self.add_attribute_dependency_for_expr(o.expr, "__aiter__")
             if o.inferred_iterator_type:
@@ -803,9 +798,6 @@ def visit_comparison_expr(self, e: ComparisonExpr) -> None:
             left = e.operands[i]
             right = e.operands[i + 1]
             self.process_binary_op(op, left, right)
-            if self.python2 and op in ("==", "!=", "<", "<=", ">", ">="):
-                self.add_operator_method_dependency(left, "__cmp__")
-                self.add_operator_method_dependency(right, "__cmp__")
 
     def process_binary_op(self, op: str, left: Expression, right: Expression) -> None:
         method = op_methods.get(op)