On Mar 3, 12:21 pm, "K Viltersten" <[EMAIL PROTECTED]> wrote:
> I'm writing a class for rational numbers
> and besides the most obvious constructor
>
> def __init__ (self, nomin, denom):
>
> i also wish to have two supporting ones
>
> def __init__ (self, integ):
> self.__init__ (integ, 1)
> def __init__ (self):
> self.__init__ (0, 1)
For this particular use case, providing default arguments will
suffice:
class Fraction:
def __init__(self, numerator=0, denomiator=1):
...
Since Python doesn't support having two methods with the same name,
the usual solution is to provide alternative constructors using
classmethod():
@classmethod
def from_decimal(cls, d)
sign, digits, exp = d.as_tuple()
digits = int(''.join(map(str, digits)))
if sign:
digits = -digits
if exp >= 0:
return cls(digits * 10 ** exp)
return cls(digits, 10 ** -exp)
Raymond
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