[issue36846] range_iterator does not use __index__

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This is a duplicate of issue17576.

--
nosy: +serhiy.storchaka
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> PyNumber_Index() is not int-subclass friendly (or 
operator.index() docos lie)

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[issue36846] range_iterator does not use __index__

[Rémi Lapeyre]

Rémi Lapeyre  added the comment:

Hi @bup, thanks for opening a new bug report. I'm not sure I get what is the 
issue though. Could you attach a more readable example and explain exactly when 
you expect __index__ to be called?

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nosy: +remi.lapeyre

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[issue36846] range_iterator does not use __index__

[Dan Snider]

New submission from Dan Snider :

I wouldn't even know where to begin to try and find a palatable solution for 
this that wouldn't be summarily dismissed. 

Perhaps it isn't unreasonable to suggest PyNumber_Index shouldn't use the less 
stringent PyLong_Check as the entry to the fast path. That is what happens 
right now and it can prevent the __index__ method defined for an int subtype 
being called in certain situation such as this one. 

Here's a silly but valid demonstration of what happens when there is more than 
1 way to skin a... index. Apologies if it is unreadable but I wanted it to be a 
'single' repl statement and cmd was being uncooperative without it being 
squished like this.


if not not not not not not True:  
class Duper(super):
def __call__(self, attr, *args):
func = super.__getattribute__(self, attr)
this = super.__self__.__get__(self)
print(f'{this!r}.{func.__name__}(%s)'%', '.join(map(repr, args)))
return super.__self_class__.__get__(self)(func(*args))
@classmethod
class unbound(classmethod):
def __set_name__(self, owner, name):
setattr(owner, name, self.__func__(owner))
class Hex(int):
__slots__ = ()
__call__ = __self__ = Duper.unbound()
def __neg__(self): return self('__neg__')
def __abs__(self): return self('__abs__')
def __add__(a, b): return a('__add__', b)
def __sub__(a, b): return a('__sub__', b)
def __mul__(a, b): return a('__mul__', b)
def __radd__(a, b): return a('__radd__', b)
def __rsub__(a, b): return a('__rsub__', b)
def __rmul__(a, b): return a('__rmul__', b)
def __floordiv__(a, b): return a('__floordiv__', b)
def __rfloordiv__(a, b): return a('__rfloordiv__', b)   
 
def __repr__(self): return f'({self.__self__.__pos__():#02x})'
a, b, c, i = (Hex(i) for i in (0, 10, 2, 2))
print(f'creating range({a}, {b}, {c})...') 
r = range(a, b, c)
print('', '-'*78)
print(f'accessing the element at r[{i!r}]...')
v = r[i]
print('', '-'*78)
print('iterating over the range...')
for i in r:
pass
print('are we there yet?...\n')

--
messages: 341845
nosy: bup
priority: normal
severity: normal
status: open
title: range_iterator does not use __index__
versions: Python 3.8

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