Python: NameError while using nested classes

Question

I encountered with the following error:

NameError: name 'JsonCleaner' is not defined

The line, causing the error is the first pair in dictionary ERROR_CODES_MAPPING_DICT (see code below):

from sshop.engine.models import WrongJsonError

class JsonCleaner:


    class NormalizeError(Exception):

        ERROR_NO_CODE = 0
        ERROR_TYPE_MISMATCH = 1
        ERROR_WRONG_VALUE = 2
        ERROR_LACK_OF_FIELD = 3

        def __init__(self, error_desc, error_code=ERROR_NO_CODE):
            self.error_desc = error_desc
            self.error_code = error_code

        def __unicode__(self):
            return repr(self.error_desc)


    # .... some methods ........


    ERROR_CODES_MAPPING_DICT = {
        # Line where exception is raised:
        JsonCleaner.NormalizeError.ERROR_NO_CODE:       WrongJsonError.NO_ERROR, 
        JsonCleaner.NormalizeError.ERROR_LACK_OF_FIELD: WrongJsonError.ERROR_LACK_OF_FIELD,
        JsonCleaner.NormalizeError.ERROR_TYPE_MISMATCH: WrongJsonError.ERROR_TYPE_MISMATCH,
        JsonCleaner.NormalizeError.ERROR_WRONG_VALUE:   WrongJsonError.ERROR_WRONG_VALUE, 
    }

What am I doing wrong?

Ignacio Vazquez-Abrams · Accepted Answer · 2011-04-13 15:07:42Z

5

The class name cannot be used within the class scope since the name isn't actually bound until the class is completely defined. Move the dict literal outside the class scope.

JsonCleaner.ERROR_CODES_MAPPING_DICT = ...

answered Apr 13, 2011 at 15:07

Ignacio Vazquez-Abrams

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Comments

Achim · Accepted Answer · 2011-04-13 15:07:50Z

3

JsonCleaner ist not completely defined at that point and therefor unknown. Just remove it and use NormalizeError.ERROR_NO_CODE and it should work.

answered Apr 13, 2011 at 15:07

Achim

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Comments

markmywords · Accepted Answer · 2011-04-13 15:08:19Z

-1

Try replacing "JsonCleaner" with "self".

 ERROR_CODES_MAPPING_DICT = {
    # Line where exception is raised:
    self.NormalizeError.ERROR_NO_CODE:       WrongJsonError.NO_ERROR, 
    self.NormalizeError.ERROR_LACK_OF_FIELD: WrongJsonError.ERROR_LACK_OF_FIELD,
    self.NormalizeError.ERROR_TYPE_MISMATCH: WrongJsonError.ERROR_TYPE_MISMATCH,
    self.NormalizeError.ERROR_WRONG_VALUE:   WrongJsonError.ERROR_WRONG_VALUE, 
}

answered Apr 13, 2011 at 15:08

markmywords

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1 Comment

Ignacio Vazquez-Abrams Over a year ago

self doesn't exist either; it only exists within a method since it's passed as one of the arguments.

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