rewrite _operator stubs (#1196)

Fixes #835

stdlib/3/_operator.pyi

@@ -1,71 +1,65 @@
 # Stubs for _operator (Python 3.5)
-#
-# NOTE: This dynamically typed stub was automatically generated by stubgen.
 
-def _compare_digest(*args, **kwargs): ...
-def abs(a): ...
-def add(a, b): ...
-def and_(a, b): ...
-def concat(a, b): ...
-def contains(a, b): ...
-def countOf(a, b): ...
-def delitem(a, b): ...
-def eq(a, b): ...
-def floordiv(a, b): ...
-def ge(a, b): ...
-def getitem(a, b): ...
-def gt(a, b): ...
-def iadd(*args, **kwargs): ...
-def iand(*args, **kwargs): ...
-def iconcat(*args, **kwargs): ...
-def ifloordiv(*args, **kwargs): ...
-def ilshift(*args, **kwargs): ...
-def imatmul(*args, **kwargs): ...
-def imod(*args, **kwargs): ...
-def imul(*args, **kwargs): ...
-def index(a): ...
-def indexOf(a, b): ...
-def inv(a): ...
-def invert(a): ...
-def ior(*args, **kwargs): ...
-def ipow(*args, **kwargs): ...
-def irshift(*args, **kwargs): ...
-def is_(a, b): ...
-def is_not(a, b): ...
-def isub(*args, **kwargs): ...
-def itruediv(*args, **kwargs): ...
-def ixor(*args, **kwargs): ...
-def le(a, b): ...
-def length_hint(obj, default=0): ...
-def lshift(a, b): ...
-def lt(a, b): ...
-def matmul(a, b): ...
-def mod(a, b): ...
-def mul(a, b): ...
-def ne(a, b): ...
-def neg(a): ...
-def not_(a): ...
-def or_(a, b): ...
-def pos(a): ...
-def pow(a, b): ...
-def rshift(a, b): ...
-def setitem(a, b, c): ...
-def sub(a, b): ...
-def truediv(a, b): ...
-def truth(a): ...
-def xor(a, b): ...
+import sys
+from typing import AnyStr
 
-class attrgetter:
-    def __init__(self, *args, **kwargs): ...
-    def __call__(self, *args, **kwargs): ...
-    def __reduce__(self): ...
+# In reality the import is the other way around, but this way we can keep the operator stub in 2and3
+from operator import (
+    truth as truth,
+    contains as contains,
+    indexOf as indexOf,
+    countOf as countOf,
+    is_ as is_,
+    is_not as is_not,
+    index as index,
+    add as add,
+    sub as sub,
+    mul as mul,
+    floordiv as floordiv,
+    truediv as truediv,
+    mod as mod,
+    neg as neg,
+    pos as pos,
+    abs as abs,
+    inv as inv,
+    invert as invert,
+    lshift as lshift,
+    rshift as rshift,
+    not_ as not_,
+    and_ as and_,
+    xor as xor,
+    or_ as or_,
+    iadd as iadd,
+    isub as isub,
+    imul as imul,
+    ifloordiv as ifloordiv,
+    itruediv as itruediv,
+    imod as imod,
+    ilshift as ilshift,
+    irshift as irshift,
+    iand as iand,
+    ixor as ixor,
+    ior as ior,
+    concat as concat,
+    iconcat as iconcat,
+    getitem as getitem,
+    setitem as setitem,
+    delitem as delitem,
+    pow as pow,
+    ipow as ipow,
+    eq as eq,
+    ne as ne,
+    lt as lt,
+    le as le,
+    gt as gt,
+    ge as ge,
+    itemgetter as itemgetter,
+    attrgetter as attrgetter,
+    methodcaller as methodcaller,
+)
+if sys.version_info >= (3, 5):
+    from operator import matmul as matmul, imatmul as imatmul
+if sys.version_info >= (3, 4):
+    from operator import length_hint as length_hint
 
-class itemgetter:
-    def __init__(self, *args, **kwargs): ...
-    def __call__(self, *args, **kwargs): ...
-    def __reduce__(self): ...
-
-class methodcaller:
-    def __init__(self, *args, **kwargs): ...
-    def __call__(self, *args, **kwargs): ...
-    def __reduce__(self): ...
+def _compare_digest(a: AnyStr, b: AnyStr) -> bool: ...