python - CustomClass复制错误: AttributeError: 'CustomClass' object has no attribute 'copy'

Question

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

当我打电话时:

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'

出了什么问题，我在这里错过了什么？

这个类非常原始，我认为 __copy__ 应该存在于 object 方法中。

谢谢

Answer 1

问题是 CashFlowSchedule 类没有 copy() 方法。

假设您要创建 CashFlowSchedule 的副本，您应该使用 Python 的 copy library .

创建浅拷贝:

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

要创建深拷贝，只需将最后一行替换为:

x_copy = copy.deepcopy(x)