[issue21444] __len__ can't return big numbers

[Zac Hatfield-Dodds]

Change by Zac Hatfield-Dodds :


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pull_requests: +17341
pull_request: https://github.com/python/cpython/pull/17934

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[issue21444] __len__ can't return big numbers

[Raymond Hettinger]

Raymond Hettinger added the comment:

I recommend this be closed:  too much impact on existing code for too little 
benefit.  

CPython has historically imposed some artificial implementation specific 
details in order make the implementation cleaner and faster internally (i.e. a 
limit on the number of function arguments, sys.maxsize limits, etc.)

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nosy: +rhettinger
priority: normal - low
type:  - enhancement
versions: +Python 3.5 -Python 3.4

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[issue21444] __len__ can't return big numbers

[Benjamin Peterson]

Changes by Benjamin Peterson benja...@python.org:


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resolution:  - wont fix
status: open - closed

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[issue21444] __len__ can't return big numbers

[Jesús Cea Avión]

Changes by Jesús Cea Avión j...@jcea.es:


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nosy: +jcea

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[issue21444] __len__

[Mark Dickinson]

Changes by Mark Dickinson dicki...@gmail.com:


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title: __len__ can't return big numbers - __len__

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[issue21444] __len__ can't return big numbers

[Mark Dickinson]

Changes by Mark Dickinson dicki...@gmail.com:


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title: __len__ - __len__ can't return big numbers

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[issue21444] __len__ can't return big numbers

[Mark Dickinson]

Mark Dickinson added the comment:

Whoops; sorry -- accidental title change by typing `__len__` into something 
that wasn't the search box.

Stupid fingers...

(I suspect this issue is a duplicate of an existing issue.)

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[issue21444] __len__ can't return big numbers

[R. David Murray]

R. David Murray added the comment:

Mark: I thought it was too, but the two I noted were the closest I could find.  
Maybe you'll find something even more on point :)

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[issue21444] __len__ can't return big numbers

[akira]

akira added the comment:

If `len()` signature can't be changed to return Python int objects (unlimited) 
then the OverflowError may contain the actual `.length`
 property instead (based on msg66459 by Antoine Pitrou)

operator.length():

def length(sized):
Return the true (possibly large) length of `sized` object.

It is equivalent to len(sized) if len doesn't raise 
OverflowError i.e., if the length is less than sys.maxsize on
CPython; otherwise return OverflowError.length attribute

try:
return len(sized)
except OverflowError as e:
return e.length

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[issue21444] __len__ can't return big numbers

[Mark Dickinson]

Mark Dickinson added the comment:

That's pretty evil. :-)

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[issue21444] __len__ can't return big numbers

[Ram Rachum]

New submission from Ram Rachum:

I want to use big numbers for length.

 class A:
... __len__ = lambda self: 10 ** 20
 len(A())
Traceback (most recent call last):
  File pyshell#5, line 1, in module
len(A())
OverflowError: cannot fit 'int' into an index-sized integer

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components: Interpreter Core
messages: 217957
nosy: cool-RR
priority: normal
severity: normal
status: open
title: __len__ can't return big numbers
versions: Python 3.4

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[issue21444] __len__ can't return big numbers

[R. David Murray]

R. David Murray added the comment:

While this is classed as a CPython implementation detail (see issue 15718) it 
doesn't sound like it is likely to be changed (see issue 2723).

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nosy: +r.david.murray

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