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Python implementation of Decimal.from_float() calls __new__ and __init__ methods of subclass.
>>> from _pydecimal import Decimal
>>> class D(Decimal):
... def __new__(cls, *args, **kwargs):
... print('__new__')
... return Decimal.__new__(cls, *args, **kwargs)
... def __init__(self, *args, **kwargs):
... print('__init__')
... 
>>> print(type(D.from_float(42)))
__new__
__init__
<class '__main__.D'>
>>> print(type(D.from_float(42.0)))
__new__
__init__
<class '__main__.D'>
But C implementation doesn't.
>>> from decimal import Decimal
>>> class D(Decimal):
... def __new__(cls, *args, **kwargs):
... print('__new__')
... return Decimal.__new__(cls, *args, **kwargs)
... def __init__(self, *args, **kwargs):
... print('__init__')
... 
>>> print(type(D.from_float(42)))
<class '__main__.D'>
>>> print(type(D.from_float(42.0)))
<class '__main__.D'>
This means that resulting instance of Decimal subclass can be in not valid state.
Example is Decimal enums (see also issue23640).
>>> from decimal import Decimal
>>> from enum import Enum
>>> class D(Decimal, Enum):
... A = Decimal('3.25')
... 
>>> D(Decimal(3.25))
<D.A: Decimal('3.25')>
>>> D(3.25)
<D.A: Decimal('3.25')>
>>> D.from_float(3.25)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/serhiy/py/cpython/Lib/enum.py", line 486, in __repr__
 self.__class__.__name__, self._name_, self._value_)
AttributeError: 'D' object has no attribute '_name_'
A solution is to reproduce Python implementation in C code:
 result = ... # create exact Decimal
 if cls is not Decimal:
 result = cls(result)
 return result