CustomClass复制错误:attributeRor:“CustomClass”对象没有属性“copy”

我在自己的.py文件中有以下类:

import pandas as pd

class CashFlowSchedule(object):
    flows = {}
    annual_growth_rate = None
    df = None

    def __init__(self, daterange, months=range(1, 13), amount=0, growth=0, growth_month=1):

        self.annual_growth_rate = growth

        for dt in daterange:

            if dt.month == growth_month:
                amount *= (1. + self.annual_growth_rate)


            if dt.month in months:
                self.flows[dt] = amount
            else:
                self.flows[dt] = 0.

        self.df = pd.DataFrame([self.flows]).T

import cf_schedule as cfs
x=cfs.CashFlowSchedule(pd.date_range('20180101','20190101'))
x.copy()

我得到:

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-22-c96b6d8d0ab0> in <module>()
----> 1 x.copy()

AttributeError: 'CashFlowSchedule' object has no attribute 'copy'

出什么事了,我还缺什么?

这门课非常原始,我想 __copy__ object 方法。

谢谢你