Convert tuples to sets for faster searches (GH-19365)

Author: rhettinger

Lib/typing.py

@@ -1716,11 +1716,11 @@ def _make_nmtuple(name, types):
 
 
 # attributes prohibited to set in NamedTuple class syntax
-_prohibited = ('__new__', '__init__', '__slots__', '__getnewargs__',
+_prohibited = {'__new__', '__init__', '__slots__', '__getnewargs__',
                '_fields', '_field_defaults', '_field_types',
-               '_make', '_replace', '_asdict', '_source')
+               '_make', '_replace', '_asdict', '_source'}
 
-_special = ('__module__', '__name__', '__annotations__')
+_special = {'__module__', '__name__', '__annotations__'}
 
 
 class NamedTupleMeta(type):