Wiped get_commands() cache when INSTALLED_APPS changes.

from django.core.exceptions import ImproperlyConfigured

from django.core.management.base import BaseCommand, CommandError, handle_default_options

from django.core.management.color import color_style

from django.utils import lru_cache

from django.utils import six

# For backwards compatibility: get_version() used to be in this module.

from django import get_version

# A cache of loaded commands, so that call_command

# doesn't have to reload every time it's called.

_commands = None

def find_commands(management_dir):

    """

    return module.Command()

@lru_cache.lru_cache(maxsize=None)

def get_commands():

    """

    Returns a dictionary mapping command names to their callback applications.

    The dictionary is cached on the first call and reused on subsequent

    calls.

    """

    global _commands

    if _commands is None:

        _commands = dict((name, 'django.core') for name in find_commands(__path__[0]))

    commands = {name: 'django.core' for name in find_commands(__path__[0])}

    # Find the installed apps

    try:

    for app_name in app_names:

        try:

            path = find_management_module(app_name)

                _commands.update(dict((name, app_name) for name in find_commands(path)))

            commands.update({name: app_name for name in find_commands(path)})

        except ImportError:

            pass  # No management module - ignore this app

    return _commands

    return commands

def call_command(name, *args, **options):

        # Rebuild templatetags module cache.

        from django.template import base

        base.templatetags_modules[:] = []

        # Rebuild management commands cache

        from django.core.management import get_commands

        get_commands.cache_clear()

@receiver(setting_changed)