CustomClass copy error: AttributeError: 'CustomClass' object has no attribute 'copy'

Question

I have the following class in its own .py file:

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

When I call:

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

I get:

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

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

What is going wrong, and what am I missing here?

This class is exceptionally primitive, and I thought __copy__ should exist in the object methods.

Thank you

To call .copy() on csf, or CashFlowSchedule, you would need to define a method called copy — Eric
– Eric, Commented Aug 13, 2018 at 1:08

brandonwang · Accepted Answer · 2018-08-13 02:02:31Z

2

The problem is that the class CashFlowSchedule does not have a copy() method.

Assuming you want to create a copy of CashFlowSchedule, you should use Python's copy library.

To create a shallow copy:

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

To create a deep copy, just replace the last line with this:

x_copy = copy.deepcopy(x)

answered Aug 13, 2018 at 2:02

brandonwang

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