SyntaxError: Generator expression must be parenthesized

Question

I just installed django and after installing that I created a django project and was trying to run django server by command:

python manage.py runserver

After that I'am getting error as: SyntaxError: Generator expression must be parenthesized

Post the code that generates the error. But the error is quite self explaining. — Willem Van Onsem, Jul 10 '18 at 12:59
Which python version you are using? 2.7 or 3.4/5? And which Django version you are using? — Anup Yadav, Jul 10 '18 at 13:00
Possible duplicate of [SyntaxError: Generator expression must be parenthezised / python manage.py migrate](https://stackoverflow.com/questions/48822571/syntaxerror-generator-expression-must-be-parenthezised-python-manage-py-migra) — Antwane, Jul 10 '18 at 13:05

Antwane · Accepted Answer · 2020-04-25T07:12:09.183

94

TL; DR: Upgrade Django to version 1.11.17+ or 2.0+

This error is a known incompatibility related to Python issue #32012. Projects based on Django 1.11.16 and below will raise this exception when started with Python 3.7. A patch for this issue has been merged into Django 2.0 and 2.1 branches and cherry-picked later into Django 1.11.17.

Note: Python 3.7 is officially supported by Django 1.11.17 and above, including any 2.x branch.

edited Apr 25 '20 at 07:12

answered Jul 10 '18 at 13:02

Antwane

20,760
7
51
84

6

That last part, updating to `1.11.17`, worked perfectly. – Edgar Ramírez Mondragón Dec 29 '18 at 06:02
That also soved the issue I was having! – Tiago Martins Peres Apr 08 '20 at 13:14
Confirm I had exactly the same issue and fix helped - upgraded django version from `1.11.9` => `1.11.17` – Taraskin Nov 24 '22 at 08:55

Sudhanshu Shekhar Jha · Answer 2 · 2018-12-20T12:13:28.143

25

Generator expression must be parenthesized

> Update Django version to 1.11.17

pip install django==1.11.17

edited Dec 20 '18 at 12:13

answered Dec 13 '18 at 10:39

Sudhanshu Shekhar Jha

259
3
4

score 2 · Answer 3 · answered Oct 06 '18 at 18:01

2

Had same issue. This is how I changed to django version 2.0 and used python3

$pip3 install django==2.0
$python3 manage.py runserver

answered Oct 06 '18 at 18:01

Tess

21
2

score 2 · Answer 4 · edited May 02 '20 at 21:33

2

Install this version: pip install django==1.11.17
Run cmd.
go to your project folder.
python manage.py runserver
it will give a URL for server and you are good to go.

edited May 02 '20 at 21:33

Azametzin

5,223
12
28
46

answered May 02 '20 at 18:42

amit Kumar

21
1

score 0 · Answer 5 · answered Mar 24 '20 at 05:06

0

This is due to the version incompatibility.Just we need to upgrade the Django version to 2.1. Run the command in cmd:Pip install django==2.1. this will resolve the issue

answered Mar 24 '20 at 05:06

Saroj Kumar

1

score 0 · Answer 6 · answered May 04 '20 at 19:22

I just faced an Error like this. I was using Django-1.11.10. I deleted it and installed Django 2.0

Problem is solved.

But if you are using ForeignKey in you model.py files it must be problem again. You should update your coding to 2.0 versiong insted of older versiyon.

Example:

django older version

user = models.ForeignKey('auth.User', related_name='posts')

django 2.0

user = models.ForeignKey('auth.User', related_name='posts', on_delete=models.CASCADE,)

score 0 · Answer 7 · edited Dec 18 '20 at 16:45

0

I had the same issue and I realized it is due to the compatibility of the Django version I was working with. So I had to state the Python version explicitly like this: >python3.6 manage.py runserver

edited Dec 18 '20 at 16:45

Dr. Mantis Tobbogan

540
8
20

answered Dec 18 '20 at 15:16

Erick Kiminza

1
1

score -1 · Answer 8 · edited Sep 04 '19 at 09:20

-1

Just open file: venv/lib/python3.7/site-packages/django/contrib/admin/widgets.py and replace the lines

related_url += '?' + '&amp;'.join(
    '%s=%s' % (k, v) for k, v in params.items(),)

with

related_url += '?' + '&amp;'.join('%s=%s' % (k, v) for k, v in params.items())

edited Sep 04 '19 at 09:20

elarcoiris

1,914
4
28
30

answered Sep 04 '19 at 08:00

CAP.tech

79
8

it work for me i upgrade my django project to 1.11 and i try to makemigrations and it give this errors and i try to change the code in to the one above and i try to migrate again and it work for so try it. – CAP.tech Sep 04 '19 at 08:16
7

This is a really bad idea -- you're changing core Django code, and now have to guarantee that your "custom" copy of Django is installed wherever your site is installed. – Lorraine Oct 13 '19 at 13:29

SyntaxError: Generator expression must be parenthesized

8 Answers8

Linked