moneyfmt.py

python的典型方法,对初学的python的人有一定的借鉴作用。

from operator import add
class MoneyFmt(float):
    def __str__(self):
        return "%.2f" % self
    def __add__(self, other):
        return MoneyFmt(float(self) + float(other))
    def __iadd__(self, other):
        self = MoneyFmt(float(self) + float(other))
        return self

m1 = MoneyFmt(4.2562)
m2 = MoneyFmt(2.4535)
m3 = m1 + m2
print m3
m1 += m3
print type(m3)
print repr(m1)