How to resolve attribute error in python

Question

on the begin I'll say that I was looking for the answer but can't find it and sorry for so basic question.I created program with TTS. I created global variable called "list_merge", but most of you said that global variables are BAD. So I decided to put this list in init. PS. ignore whitespaces, they exist only because I copied it here.

the error is: AttributeError: 'Ver2ProjectWithTTS' object has no attribute 'list_merge'

import json
import pyttsx
from openpyxl import load_workbook

class Ver2ProjectWithTTS(object):

    def __init__(self):
        self.read_json_file()
        self.read_xml_file()
        self.say_something()
        self.list_merge = []

    def read_json_file(self):
        with open("json-example.json", 'r') as df:
            json_data = json.load(df)
            df.close()
        for k in json_data['sentences']:
            text_json = k['text']
            speed_json = int(k['speed'])
            volume_json = float(k['volume'])
            dict_json = {'text': text_json, 'speed': speed_json, 'volume': volume_json}
            self.list_merge.append(dict_json)

    def read_xml_file(self):
        tree = et.parse('xml-example.xml')
        root = tree.getroot()
        for k in range(0, len(root)):
            text_xml = root[k][0].text
            speed_xml = int(root[k][1].text)
            volume_xml = float(root[k][2].text)
            dict_xml = {'text': text_xml, 'speed': speed_xml, 'volume': volume_xml}
            self.list_merge.append(dict_xml)

    def say_something(self):
        for item in self.list_merge:
            engine = pyttsx.init()
            engine.getProperty('rate')
            engine.getProperty('volume')
            engine.setProperty('rate', item['speed'])
            engine.setProperty('volume', item['volume'])
            engine.say(cleared_text)
            engine.runAndWait()

if __name__ == '__main__':
    a = Ver2ProjectWithTTS()

I'm getting AttributeError: 'Ver2ProjectWithTTS' object has no attribute 'list_merge'

Any ideas how to avoid this error? Well i'm not good in objectivity and I just cant move on without fixing this. PS. with global variable before init def it worked properly. Thanks for help :)

AttributeError: 'Ver2ProjectWithTTS' object has no attribute 'list_merge' — degath
– degath, Commented Aug 17, 2016 at 7:57
It's hard to 'ignore whitespaces' when they are part of the syntax. Is that your actual indentation ? — polku
– polku, Commented Aug 17, 2016 at 7:57
I mean, there are no tabs in this code which I printed for you, but in mine it's all ok. :) I know whitespaces are important and the problem isnt with whitespaces. :) — degath
– degath, Commented Aug 17, 2016 at 7:58

Stan · Accepted Answer · 2016-08-17 08:01:25Z

4

You have to set if first before you use it:

class Ver2ProjectWithTTS(object):

    def __init__(self):
        # first set it
        self.list_merge = []
        self.read_json_file()
        self.read_xml_file()
        self.say_something()

Anyway don't do any advanced logic in constructors, it's not a good practice. Make a method instead:

class Ver2ProjectWithTTS(object):

    def __init__(self):
        # first set it
        self.list_merge = []

    def do_the_job(self):
        self.read_json_file()
        self.read_xml_file()
        self.say_something()

    ...

instance = Ver2ProjectWithTTS()
instance.do_the_job()

answered Aug 17, 2016 at 8:01

Stan

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1 Comment

degath Over a year ago

Thanks, great answer. :-)

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