id summary reporter owner description type status component version severity resolution keywords cc stage has_patch needs_docs needs_tests needs_better_patch easy ui_ux 25624 Autoreload fails if jinja2.ModuleLoader used SvartalF Tom Forbes "It happens because `jinja2.ModuleLoader` injects a weakref to a fake module into a sys.modules: https://github.com/mitsuhiko/jinja2/blob/f6b654de615de61a9ca79e7ccecf7b4a8bf90ec0/jinja2/loaders.py#L439-L449 So, because weakref is not a hashable object, autoreload fails. {{{ Traceback (most recent call last): File ""bug/manage.py"", line 10, in execute_from_command_line(sys.argv) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/core/management/__init__.py"", line 351, in execute_from_command_line utility.execute() File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/core/management/__init__.py"", line 343, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/core/management/base.py"", line 394, in run_from_argv self.execute(*args, **cmd_options) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py"", line 49, in execute super(Command, self).execute(*args, **options) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/core/management/base.py"", line 445, in execute output = self.handle(*args, **options) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py"", line 88, in handle self.run(**options) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/core/management/commands/runserver.py"", line 97, in run autoreload.main(self.inner_run, None, options) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/utils/autoreload.py"", line 336, in main reloader(wrapped_main_func, args, kwargs) File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/utils/autoreload.py"", line 302, in python_reloader reloader_thread() File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/utils/autoreload.py"", line 278, in reloader_thread change = fn() File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/utils/autoreload.py"", line 207, in code_changed for filename in gen_filenames(): File ""/home/svartalf/projects/dj-module-loader-bug/.env/local/lib/python2.7/site-packages/django/utils/autoreload.py"", line 94, in gen_filenames module_values = set(sys.modules.values()) TypeError: unhashable type: 'weakproxy' }}} I had reproduced this bug with a clean project and following environment: {{{ Python 2.7.6 $ pip freeze Django==1.8.5 Jinja2==2.7.3 MarkupSafe==0.23 argparse==1.2.1 wsgiref==0.1.2 }}} Template settings: {{{ template_loader = jinja2.ModuleLoader('compiled_templates') TEMPLATES = [ { 'BACKEND': 'django.template.backends.jinja2.Jinja2', 'DIRS': [os.path.join(BASE_DIR, 'templates')], 'APP_DIRS': True, 'OPTIONS': { 'loader': template_loader, }, }, ] }}} P.S. Not sure if it is an ""Utilities"" or a ""Template system"" component." Bug closed Utilities 1.8 Normal fixed autoreload, jinja2, ModuleLoader Accepted 1 0 0 0 0 0