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The += and *= operators have strange behavior when the
LHS is a Decimal and the RHS is a float (as of
2005年11月13日 CVS decimal.py).
Example:
>>> d = Decimal('1.02')
>>> d += 2.1
>>> d
NotImplemented
A blatant violation of "Errors should never pass silently."
Also, a bad error description is produced for the *=
operator:
>>> d = Decimal('1.02')
>>> d *= 2.9
Traceback (most recent call last):
 File "<stdin>", line 1, in ?
TypeError: can't multiply sequence by non-int