How to access class variable inside methods of that class in python?

• Operating System: Windows, 64bit
• Python Version: 3.7.11
• IDE: Jupyter Notebook (with conda env)

I have below code:

class Vocabulary(object):
    
    PAD_token = 0
    
    def __init__(self):
        self.index2word = {PAD_token: "PAD"}

# create object
voc = Vocabulary()

I want to use PAD_token class variable inside __init__ method but I got below error:

NameError                                 Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_8472/897996601.py in <module>
----> 1 voc = Vocabulary()

~\AppData\Local\Temp/ipykernel_8472/3780152240.py in __init__(self)
      4 
      5     def __init__(self):
----> 6         self.index2word = {PAD_token: "PAD", SOS_token: "SOS", EOS_token: "EOS"}

NameError: name 'PAD_token' is not defined

Question:

• How can I use PAD_token class variable inside __init__ or other methods of the class?

>Solution :

There are two ways to access it

first: self.__class__.PAD_token

second: self.PAD_token

If you just need to access class variables, the first one is recommended