New submission from Dan Snider <mr.assume.a...@gmail.com>:
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
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36846>
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