python class AttributeError

Question

The purpose of this script is:

• Read a group of csv files.

• Scrape the date and extract some features out of it.

• Merge these csv files into a single data frame.

• Import the final data frame into another class and print it.

Here is the code:

import pandas as pd
import os


class DataSource:
    def __init__(self):
        self.dfs = []
        self.final = pd.DataFrame()
        self.names = ['Date', 'Time', 'open', 'high', 'low', 'close', 'Volume']
        self.directory = os.chdir(r"C:\Users\Sayed\Desktop\forex")

    def merge(self):
        for file in os.listdir(self.directory):
            df = pd.read_csv(file, names=self.names,
                             parse_dates={'Release Date': ['Date', 'Time']})
            self.dfs.append(df)

        self.final = pd.concat(self.dfs, axis=0)
        self.final = self.final[['Release Date', 'open', 'high', 'low', 'close']]
        print(self.final.head())
        return self.final


class test():
    def __init__(self):
        self.df = DataSource.final

    def print(self):
        return print(self.df.head())

x = test()
x.print()

Here is the error:

Traceback (most recent call last):

File "C:/Users/Sayed/PycharmProjects/project/hello.py", line 31, in x = test()

File "C:/Users/Sayed/PycharmProjects/project/hello.py", line 26, in init self.df = DataSource.final

AttributeError: type object 'DataSource' has no attribute 'final'

Yeah, final is an instance attribute, not a class attribute. DataSource().final would work for example… — deceze
– deceze ♦, Commented Jun 4, 2020 at 8:21
You haven't initialized a Datasource instance. final belongs to an instance, not the class. (It is inside the init) Therefore you cannot access final without initializing an instance of Datasource. That said, I have no idea what you're trying to achieve with the test class. — Ahmet
– Ahmet, Commented Jun 4, 2020 at 8:21

ArtyGator · Accepted Answer · 2020-06-04 08:32:51Z

1

Your cannot access self.final property directly in your DataSource class. You need to instantiate it first. So your test class will more be like :

class test():
    def __init__(self):
        self.d = DataSource()
        self.df = self.d.merge()
    def print(self):
        return print(self.df.head())

answered Jun 4, 2020 at 8:32

ArtyGator

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