New submission from Elvis Pranskevichus:
Consider the following:
import decimal
class MyDecimal(decimal.Decimal):
def __new__(cls, value):
return super().__new__(cls, value)
a = decimal.Decimal('1.0')
b = MyDecimal(a)
c = MyDecimal('1.0')
print(type(a), type(b), isinstance(b, MyDecimal), type(c), isinstance(c,
MyDecimal))
Running the above in 3.3 produces:
<class 'decimal.Decimal'> <class 'decimal.Decimal'> False <class
'__main__.MyDecimal'> True
Which shows that Decimal.__new__(cls, Decimal()) will always return its
argument regardless of cls.
----------
messages: 175121
nosy: Elvis.Pranskevichus, skrah
priority: normal
severity: normal
status: open
title: CDecimal disregards subclass passed into __new__ when value argument is
an instance of Decimal
type: behavior
versions: Python 3.3, Python 3.4
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Python tracker <[email protected]>
<http://bugs.python.org/issue16431>
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