Source code for permission.compat

# coding=utf-8
import django

if django.VERSION >= (1, 9):
    add_to_builtins = None
else:
    try:
        from django.template.base import add_to_builtins
    except ImportError:
        from django.template.loader import add_to_builtins

try:
    # django.utils.importlib is removed from Django 1.9
    from importlib import import_module
except ImportError:
    from django.utils.importlib import import_module

if django.VERSION < (1, 10):

    def is_authenticated(user_obj):
        return user_obj.is_authenticated()

    def is_anonyomus(user_obj):
        return user_obj.is_anonymous()

else:

    def is_authenticated(user_obj):
        return user_obj.is_authenticated

    def is_anonyomus(user_obj):
        return user_obj.is_anonymous


try:
    # Django 1.7 or over use the new application loading system
    from django.apps import apps

    get_model = apps.get_model
except ImportError:
    from django.db.models.loading import get_model

try:
    from django.utils.module_loading import import_string
except ImportError:
    try:
        from django.utils.module_loading import import_by_path as import_string
    except ImportError:

        def import_string(dotted_path):
            try:
                module_path, class_name = dotted_path.rsplit(".", 1)
            except ValueError:
                raise ImportError("%s doesn't look like a module path" % dotted_path)
            module = import_module(module_path)
            try:
                return getattr(module, class_name)
            except AttributeError:
                raise ImportError(
                    'Module "%s" does not define a "%s" attribute/class'
                    % (module_path, class_name)
                )


try:
    # Python 3
    from urllib.parse import urlparse
except ImportError:
    # Python 2
    from urlparse import urlparse

import sys

if sys.version_info >= (3, 0):

    def isstr(x):
        return isinstance(x, str)

else:

    def isstr(x):
        return isinstance(x, basestring)