Remove dependency to six module

requirements.txt

@@ -1,4 +1,3 @@
 cached-property
-Django>=1.8
+Django>=2.2
 enum-compat
-six

test_project/generic/models.py

@@ -1,18 +1,15 @@
-import six
 from django.contrib.contenttypes.fields import GenericForeignKey
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class ModelA(models.Model):
     name = models.CharField(max_length=64)
 
     def __str__(self):
         return self.name
 
 
-@six.python_2_unicode_compatible
 class ModelB(models.Model):
     name = models.CharField(max_length=64)
     a = models.ForeignKey(

test_project/many_to_many/models.py

@@ -1,8 +1,6 @@
-import six
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class Publication(models.Model):
     title = models.CharField(max_length=30)
 
@@ -13,7 +11,6 @@ class Meta:
         ordering = ("title",)
 
 
-@six.python_2_unicode_compatible
 class Article(models.Model):
     headline = models.CharField(max_length=100)
     publications = models.ManyToManyField(Publication, related_name="articles")

test_project/many_to_one/models.py

@@ -1,8 +1,6 @@
-import six
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class Reporter(models.Model):
     first_name = models.CharField(max_length=30)
     last_name = models.CharField(max_length=30)
@@ -12,7 +10,6 @@ def __str__(self):
         return "%s %s" % (self.first_name, self.last_name)
 
 
-@six.python_2_unicode_compatible
 class Article(models.Model):
     headline = models.CharField(max_length=100)
     pub_date = models.DateField()

test_project/one_to_one/models.py

@@ -1,8 +1,6 @@
-import six
 from django.db import models
 
 
-@six.python_2_unicode_compatible
 class Place(models.Model):
     name = models.CharField(max_length=50)
     address = models.CharField(max_length=80)
@@ -11,7 +9,6 @@ def __str__(self):
         return "%s the place" % self.name
 
 
-@six.python_2_unicode_compatible
 class Restaurant(models.Model):
     place = models.OneToOneField(Place, primary_key=True, on_delete=models.CASCADE)
     serves_hot_dogs = models.BooleanField(default=False)
@@ -21,7 +18,6 @@ def __str__(self):
         return "%s the restaurant" % self.place.name
 
 
-@six.python_2_unicode_compatible
 class Waiter(models.Model):
     restaurant = models.ForeignKey(Restaurant, on_delete=models.CASCADE)
     name = models.CharField(max_length=50)

tests/backends/test_sqlalchemy.py

@@ -1,5 +1,4 @@
 import pytest
-import six
 from alchemy_mock.comparison import ExpressionMatcher
 from sqlalchemy import func
 from sqlalchemy.orm import joinedload
@@ -31,7 +30,7 @@ def test_empty(self, alchemy_db):
             alchemy_db.query(Place), context={"context": "here"}
         )
 
-        assert "WHERE 0 = 1" in six.text_type(backend.empty())
+        assert "WHERE 0 = 1" in str(backend.empty())
 
     def test_get_model(self, alchemy_db):
         backend = SQLAlchemyFilterBackend(alchemy_db.query(Place))
@@ -54,7 +53,7 @@ def test_filter(self, alchemy_db):
 
         filtered = backend.filter()
 
-        sql = six.text_type(filtered)
+        sql = str(filtered)
         # eagerloads via outerjoin
         assert "LEFT OUTER JOIN one_to_one_restaurant" not in sql
         assert "LEFT OUTER JOIN one_to_one_waiter" not in sql
@@ -74,7 +73,7 @@ def test_filter_already_selectinload(self, alchemy_db):
 
         filtered = backend.filter()
 
-        sql = six.text_type(filtered)
+        sql = str(filtered)
         # eagerloads via outerjoin
         assert "LEFT OUTER JOIN one_to_one_restaurant" in sql
         assert "LEFT OUTER JOIN one_to_one_waiter" not in sql
@@ -94,7 +93,7 @@ def test_filter_already_eagerloaded(self, alchemy_db):
 
         filtered = backend.filter()
 
-        sql = six.text_type(filtered)
+        sql = str(filtered)
         # eagerloads via outerjoin
         assert "LEFT OUTER JOIN one_to_one_restaurant" in sql
         assert "LEFT OUTER JOIN one_to_one_waiter" in sql

url_filter/backends/base.py

@@ -1,10 +1,9 @@
 import abc
 
-import six
 from cached_property import cached_property
 
 
-class BaseFilterBackend(six.with_metaclass(abc.ABCMeta, object)):
+class BaseFilterBackend(metaclass=abc.ABCMeta):
     """
     Base filter backend from which all other backends must subclass.
 

url_filter/filters.py

@@ -2,7 +2,6 @@
 import re
 from functools import wraps
 
-import six
 from cached_property import cached_property
 from django import forms
 from django.core.exceptions import ValidationError
@@ -38,7 +37,7 @@
 )
 
 
-class BaseFilter(six.with_metaclass(abc.ABCMeta, object)):
+class BaseFilter(metaclass=abc.ABCMeta):
     """
     Base class to be used for defining both filters and filtersets.
 
@@ -72,11 +71,6 @@ def __init__(self, source=None, *args, **kwargs):
         self.name = None
         self.is_bound = False
 
-    def __repr__(self):
-        data = self.repr()
-        data = data if six.PY3 else data.encode("utf-8")
-        return data
-
     @abc.abstractmethod
     def repr(self, prefix=""):
         """

url_filter/filtersets/base.py

@@ -1,9 +1,9 @@
 import abc
+import functools
 import re
 from collections import defaultdict
 from copy import deepcopy
 
-import six
 from cached_property import cached_property
 from django.core.exceptions import ValidationError
 from django.core.validators import RegexValidator
@@ -88,7 +88,7 @@ def __new__(cls, name, bases, attrs):
         return new_class
 
 
-class FilterSet(six.with_metaclass(FilterSetMeta, BaseFilter)):
+class FilterSet(BaseFilter, metaclass=FilterSetMeta):
     """
     Main user-facing classes to use filtersets.
 
@@ -395,7 +395,7 @@ def _generate_lookup_configs(self):
             for value in values:
                 yield LookupConfig(
                     key,
-                    six.moves.reduce(
+                    functools.reduce(
                         lambda a, b: {b: a},
                         (key.replace("!", "").split(LOOKUP_SEP) + [value])[::-1],
                     ),

url_filter/filtersets/plain.py

@@ -1,7 +1,6 @@
 from datetime import date, datetime, time
 from decimal import Decimal
 
-import six
 from django import forms
 
 from ..backends.plain import PlainFilterBackend
@@ -13,8 +12,8 @@
 
 DATA_TYPES_MAPPING = SubClassDict(
     {
-        six.string_types: forms.CharField(),
-        six.integer_types: forms.IntegerField(),
+        str: forms.CharField(),
+        int: forms.IntegerField(),
         bool: forms.BooleanField(required=False),
         float: forms.FloatField(),
         Decimal: forms.DecimalField(),