Docker Compose和Django生成器语法错误

Question

I'm new to Docker and have been trying to set up Django with Docker. I've been following the instructions here but am running into the error down below.

  File "/usr/local/lib/python3.7/site- 
  packages/django/contrib/admin/widgets.py", line 152
  web_1  |     '%s=%s' % (k, v) for k, v in params.items(),
  web_1  |     ^
  web_1  | SyntaxError: Generator expression must be parenthesized

My Django version is 2.1, Python 3.7. As far as I know, this shouldn't be happening, yet it is. I have checked the file in question, and it is written correctly. It was a fix that was put into place that should have fixed this error in the past with the latest version of Python.

EDIT Adding Docker file here:

 FROM python:3
 ENV PYTHONUNBUFFERED 1
 RUN mkdir /code
 WORKDIR /code
 ADD requirements.txt /code/
 RUN pip install -r requirements.txt
 ADD . /code/

docker-compose.yml file:

version: '3'

services:
  db:
    image: postgres
  web:
    build: .
    command: python3 manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    depends_on:
      - db

From widgets.py:

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

This is the entire definition form widgets.py:

def get_context(self, name, value, attrs):
    context = super().get_context(name, value, attrs)
    rel_to = self.rel.model
    if rel_to in self.admin_site._registry:
        # The related object is registered with the same AdminSite
        related_url = reverse(
            'admin:%s_%s_changelist' % (
                rel_to._meta.app_label,
                rel_to._meta.model_name,
            ),
            current_app=self.admin_site.name,
        )

        params = self.url_parameters()
        if params:
            related_url += '?' + '&'.join('%s=%s' % (k, v) for k, v in params.items())
        context['related_url'] = mark_safe(related_url)
        context['link_title'] = _('Lookup')
        # The JavaScript code looks for this class.
        context['widget']['attrs'].setdefault('class', 'vForeignKeyRawIdAdminField')
    if context['widget']['value']:
        context['link_label'], context['link_url'] = self.label_and_url_for_value(value)
    return context

However, I still get the same error code when trying to compose-up.

I have no idea what to do at this point; I'm at a complete loss. This is the first time I've run into this problem.

Answer 1

First of all

Your Django version is not compatible with Python 3.7

So make these changes

In your Dockerfile

FROM python:3.6 

Restart docker using sudo service docker restart

then sudo docker-compose up --build

or sudo docker-compose run web python manage.py migrate and sudo docker-compose up --build

Answer 2

It seems that you are trying to run sample from byob-profiles-rest-api .

• This example is pretty old and you have to down grade your versions:

Change your Django version to 1.11 to avoid error

ModuleNotFoundError: No module named 'django.core.urlresolvers'

Change your Python version to 3.6

SyntaxError: Generator expression must be parenthesized

• You files should now look like this

Dockerfile

FROM python:3.6

ENV PYTHONBUFFERED 1
RUN mkdir /code
WORKDIR /code
COPY . /code/
RUN pip install -r requirements.txt

requirements.txt

appdirs==1.4.3
Django==1.11
djangorestframework==3.6.2
packaging==16.8
pyparsing==2.2.0
pytz==2017.2
six==1.10.0

• Delete the old image of byob-profiles-rest-api
• Recreate the image by running

docker-compose run web python src/profiles_project/manage.py migrate

You should see that there's no more errors.

Running migrations:    
Applying contenttypes.0001_initial... OK   
Applying contenttypes.0002_remove_content_type_name... OK   
Applying auth.0001_initial... OK   
Applying auth.0002_alter_permission_name_max_length... OK   
Applying auth.0003_alter_user_email_max_length... OK   
Applying auth.0004_alter_user_username_opts... OK   
Applying auth.0005_alter_user_last_login_null... OK   
Applying auth.0006_require_contenttypes_0002... OK   
Applying auth.0007_alter_validators_add_error_messages... OK   
Applying auth.0008_alter_user_username_max_length... OK   
Applying profiles_api.0001_initial... OK   
Applying admin.0001_initial... OK   
Applying admin.0002_logentry_remove_auto_add... OK   
Applying authtoken.0001_initial... OK   
Applying authtoken.0002_auto_20160226_1747... OK   
Applying profiles_api.0002_profilefeeditem... OK   
Applying sessions.0001_initial... OK

• Build and start the server

sudo docker-compose up --build