Skip to main content

A flake8 extension that checks classes attributes order

Project description


Build Status Maintainability Test Coverage

An extension for flake8 to report on wrong class attributes order and class level logic.

The validator can extract class attribute type: docstring, property, nested class, GLOBAL_VAR, etc. If django model fields are detected, the validator can detect, if the field is link to another table (foreign key, generic key, etc) or not.

After resolving each attribute type, validator checks attributes order. For example, here are default methods order: __init__, __str__, save, delete, @property, @staticmethod, @classmethod, other methods, underscored methods. If the order is broken, validator will report on it.

Besides methods, the validator checks other attributes methods: docstrings, nested classes, constants, attributes, and so on.

Also validator checks, if class has no class level logic and report if any. Here is an example:

class PhoneForm(forms.Form):
    phone = forms.CharField(17, label='Телефон'.upper())
    phone.widget.attrs.update({'class': 'form-control phone'})  # this should happens in __init__!


pip install flake8-class-attributes-order


DEBUG = True

class User:
    def fetch_info_from_crm(self):

    LOGIN_FIELD = 'email'  # wtf? this should be on top of class definition!

class UserNode:
    class Meta:
        model = User

    if DEBUG:  # not great idea at all
        def is_synced_with_crm(self):


$ flake8 CCE001 User.fetch_info_from_crm should be after User.LOGIN_FIELD CCE002 Class level expression detected model UserNode, line 15

Tested on Python 3.6 and 3.7.2 and flake8 3.7.5.

Error codes

Error code Description
CCE001 Wrong class attributes order (XXX should be after YYY)
CCE002 Class level expression detected


We would love you to contribute to our project. It's simple:

  1. Create an issue with bug you found or proposal you have. Wait for approve from maintainer.
  2. Create a pull request. Make sure all checks are green.
  3. Fix review comments if any.
  4. Be awesome.

Here are useful tips:

  • You can run all checks and tests with make check. Please do it before TravisCI does.
  • We use BestDoctor python styleguide. Sorry, styleguide is available only in Russian for now.
  • We respect Django CoC. Make soft, not bullshit.

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

flake8_class_attributes_order-0.0.4.tar.gz (5.0 kB view hashes)

Uploaded Source

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page