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Issue 4998: Decimal should not subclass or register with numbers.Real.

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This commit is contained in:
Raymond Hettinger 2009-01-20 07:24:44 +00:00
parent 7bf3a0e866
commit a0fd8884ca
2 changed files with 5 additions and 6 deletions
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11
Lib/decimal.py
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@ -134,7 +134,6 @@ __all__ = [
'setcontext', 'getcontext', 'localcontext' 'setcontext', 'getcontext', 'localcontext'
] ]
import numbers as _numbers
import copy as _copy import copy as _copy
import math as _math import math as _math
@ -501,7 +500,11 @@ def localcontext(ctx=None):
##### Decimal class ####################################################### ##### Decimal class #######################################################
class Decimal(_numbers.Real): # Do not subclass Decimal from numbers.Real and do not register it as such
# (because Decimals are not interoperable with floats). See the notes in
# numbers.py for more detail.
class Decimal(object):
"""Floating point class for decimal arithmetic.""" """Floating point class for decimal arithmetic."""
__slots__ = ('_exp','_int','_sign', '_is_special') __slots__ = ('_exp','_int','_sign', '_is_special')
@ -1757,14 +1760,10 @@ class Decimal(_numbers.Real):
>>> round(Decimal('Inf')) >>> round(Decimal('Inf'))
Traceback (most recent call last): Traceback (most recent call last):
... ...
...
...
OverflowError: cannot round an infinity OverflowError: cannot round an infinity
>>> round(Decimal('NaN')) >>> round(Decimal('NaN'))
Traceback (most recent call last): Traceback (most recent call last):
... ...
...
...
ValueError: cannot round a NaN ValueError: cannot round a NaN
If a second argument n is supplied, self is rounded to n If a second argument n is supplied, self is rounded to n

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