reformat codestyle

Cython/Compiler/PyrexTypes.py

@@ -653,7 +653,7 @@ class MemoryViewSliceType(PyrexType):
         assert not pyrex
         assert not dll_linkage
         from . import MemoryView
-        base_code = self.__str__() if for_display else MemoryView.memviewslice_cname
+        base_code = str(self) if for_display else MemoryView.memviewslice_cname
         return self.base_declaration_code(
                 base_code,
                 entity_code)