TypeError: 'set' object is not reversible

[Edwar Baron]

I have updated the version of Django to 2.0 in an existing project, and I have followed all the steps necessary for the project to be compatible.

but I'm having problems in the administrator when creating or editing a model that uses attributes from this django-markdownx library

the current configuration of the project of the usa packages:

amqp (2.2.2)
apipkg (1.4)
asn1crypto (0.23.0)
attrs (17.3.0)
Babel (2.5.1)
bcrypt (3.1.4)
billiard (3.5.0.3)
celery (4.1.0)
certifi (2017.11.5)
cffi (1.11.2)
chardet (3.0.4)
coreapi (2.3.3)
coreschema (0.0.4)
coverage (4.4.2)
cryptography (2.1.4)
Django (2.0)
django-celery-results (1.0.1)
django-colorfield (0.1.14)
django-constance (2.0.0)
django-cors-headers (2.1.0)
django-environ (0.4.4)
django-excel-response (2.0.2)
django-extensions (1.9.8)
django-filter (1.1.0)
django-markdownx (2.0.21)
django-picklefield (1.0.0)
django-redis (4.8.0)
django-redis-cache (1.7.1)
django-rest-swagger (2.1.2)
djangorestframework (3.7.3)
et-xmlfile (1.0.1)
execnet (1.5.0)
Fabric3 (1.13.1.post1)
factory-boy (2.7.0)
fake-factory (0.7.4)
flower (0.9.2)
idna (2.6)
isort (4.2.15)
itypes (1.1.0)
jdcal (1.3)
Jinja2 (2.10)
kombu (4.1.0)
Markdown (2.6.10)
MarkupSafe (1.0)
olefile (0.44)
opbeat (3.6.0)
openapi-codec (1.3.2)
openpyxl (2.4.9)
paramiko (2.4.0)
pep8 (1.7.1)
Pillow (4.3.0)
pip (9.0.1)
pluggy (0.6.0)
psycopg2 (2.7.3.2)
py (1.5.2)
pyasn1 (0.4.2)
pycparser (2.18)
pyflakes (1.6.0)
PyNaCl (1.2.1)
pytest (3.3.1)
pytest-cache (1.0)
pytest-cov (2.5.1)
pytest-django (3.1.2)
pytest-flakes (2.0.0)
pytest-isort (0.1.0)
pytest-pep8 (1.0.6)
pytest-sugar (0.9.0)
python-dateutil (2.6.1)
pytz (2017.3)
redis (2.10.6)
requests (2.18.4)
setuptools (36.4.0)
simplejson (3.13.2)
six (1.11.0)
sorl-thumbnail (12.4.1)
termcolor (1.1.0)
tornado (4.5.2)
typing (3.6.2)
uritemplate (3.0.0)
urllib3 (1.22)
vine (1.1.4)
Werkzeug (0.13)
wheel (0.30.0)

the error is caused in this file

File "/usr/local/lib/python3.6/site-packages/django/forms/widgets.py", line 114, in merge

...
        combined_list = list(list_1)
        last_insert_index = len(list_1)
        # Walk list_2 in reverse, inserting each element into combined_list if
        # it doesn't already exist.
        for path in reversed(list_2):

TypeError: 'set' object is not reversible
...

Local variables in frame

last_insert_index	0
combined_list	[]
list_2	                set(['markdownx/js/markdownx.js'])
list_1	                []

the variable list_2 is a list of set type

the simple solution that I think

is to convert that variable to a list, or that the function reversed, support that set type of data