flake8-function-order

An extension for flake8 to report on wrong class attributes order and class level logic, adapted from the flake8-class-attributes-order package by @best-doctor.

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.

Default configuration checks for the following order of attributes:

• __new__
• __init__
• __post_init__
• other magic methods
• @property
• @staticmethod
• @classmethod
• other methods
• private 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())

    # this should happen in __init__!
    phone.widget.attrs.update({'class': 'form-control phone'})

Installation

pip install flake8-function-order

Configurable options:

* if not provided, will use its supertype order

** if not defined, such base types and all their subtypes (unless defined) will be ignored during validation. It's recommended to set at least nested_class, field and method

You choose how detailed your configuration is. For example, you can define order of each supported magic method (__new__, __str__, etc.), or set magic_method to allow any order among them or even just use method

Usage:

$ flake8 test.py
test.py:5:5: CCE001 User.fetch_info_from_crm should be after User.LOGIN_FIELD
test.py:15:5: CCE002 Class level expression detected model UserNode, line 15

Tested on Python 3.7.x and flake8 3.7.5.

Error codes