[issue5169] Default hash not equal to id on AMD Sempron

[Chema Cortés]

New submission from Chema Cortés :

Sometimes, the default hash for user-defined object is not equal to the
id of the object:

In [1]: class A:
  ...:   pass

In [2]: a=A()

In [3]: id(a),hash(a)
Out[3]: (3082955212L, -1212012084)

The test box has an AMD Sempron, a 64bit CPU archictecture emulating a
32bit one. This following relation can be deduced:

hash(a)=id(a)-2**32

--
components: Interpreter Core
messages: 81269
nosy: chemacortes, jcea
severity: normal
status: open
title: Default hash not equal to id on AMD Sempron
type: behavior
versions: Python 2.5

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[issue5169] Default hash not equal to id on AMD Sempron

[Chema Cortés]

Chema Cortés  added the comment:

I also agree to close this bug as invalid. Indeed, there is not any
reason to make equal id(a) and hash(a), but the description of
"hashable" object from the documentation (but this is a different
issue).

'hash' and 'id' returns the same-wordsize integer (32bit): 'id' as
unsigned long (Py_uintptr_t), and 'hash' as signed long casted from
'id'.

Thanks for your time,
Chema

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[issue5186] Reduce hash collisions for objects with no __hash__ method

[Chema Cortés]

Changes by Chema Cortés :


--
nosy: +chemacortes

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[issue26156] Bad name into power operator syntax

[Chema Cortés]

New submission from Chema Cortés:

The documentation erroneously changes "primary" for "away" in the power 
operator syntax:

https://docs.python.org/3.6/reference/expressions.html#the-power-operator
https://docs.python.org/3.5/reference/expressions.html#the-power-operator

--
assignee: docs@python
components: Documentation
messages: 258596
nosy: Chema Cortés, docs@python
priority: normal
severity: normal
status: open
title: Bad name into power operator syntax
versions: Python 3.5, Python 3.6

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