Category: Python

Sometimes, we wan to get all related Python Django model objects.

In this article, we’ll look at how to get all related Python Django model objects.

How to get all related Python Django model objects?

To get all related Python Django model objects, we use the NestedObjects class.

For instance, we write

from django.contrib.admin.utils import NestedObjects

collector = NestedObjects(using="default") 
collector.collect([objective])
print(collector.data)

to create a NestedObjects object with the using argument set to the database name.

Then we call collect with an array of objects to get the related objects.

Finally, we get the data from collector.data.

Conclusion

To get all related Python Django model objects, we use the NestedObjects class.

Sometimes, we want to duplicate virtualenv with Python.

In this article, we’ll look at how to duplicate virtualenv with Python.

How to duplicate virtualenv with Python?

To duplicate virtualenv with Python, we can generate a requirements file.

To do this, we run

pip freeze > requirements.txt

to record the package in the virtualenv into requirements.txt.

Then when we create a new virtualenv, we run

pip install -r requirements.txt

to install the packages from requirements.txt.

Conclusion

To duplicate virtualenv with Python, we can generate a requirements file.

Sometimes, we want to copy InMemoryUploadedFile object to disk with Python Django.

In this article, we’ll look at how to copy InMemoryUploadedFile object to disk with Python Django.

How to copy InMemoryUploadedFile object to disk with Python Django?

To copy InMemoryUploadedFile object to disk with Python Django, we can use the save method.

For instance, we write

import os
from django.core.files.storage import default_storage
from django.core.files.base import ContentFile
from django.conf import settings

data = request.FILES['image']

path = default_storage.save('tmp/somename.mp3', ContentFile(data.read()))
tmp_file = os.path.join(settings.MEDIA_ROOT, path)

in our view function.

We get the file from request.FILES.

And then we call default_storage.save with the file path to save to and the ContentFile object that we create by reading data.

Then we get the path of the saved file with os.path.join(settings.MEDIA_ROOT, path).

Conclusion

To copy InMemoryUploadedFile object to disk with Python Django, we can use the save method.

Sometimes, we want to deploy a minimal Python Flask app in Docker.

In this article, we’ll look at how to deploy a minimal Python Flask app in Docker.

How to deploy a minimal Python Flask app in Docker?

To deploy a minimal Python Flask app in Docker, we create a Dockerfile in our Flask project directory.

For instance, we write

FROM dreen/flask
MAINTAINER dreen
WORKDIR /src


RUN mkdir -p /src
COPY . .

EXPOSE 5000
CMD ["python", "index.py"]

in our Dockerfile.

Then in index.py, we write

# ...

if __name__ == '__main__':
    app.run(host='0.0.0.0')

to run the app and expose it to all computers in the local network so that it can be served over the Internet.

Then we run

sudo docker run -i -p 5000:5000 -d my-project

to create the Docker image from the Flask project which is in the my-project directory with the Dockerfile inside.

Conclusion

To deploy a minimal Python Flask app in Docker, we create a Dockerfile in our Flask project directory.

Sometimes, we want to add a link to Python Flask static files with url_for.

In this article, we’ll look at how to add a link to Python Flask static files with url_for.

How to add a link to Python Flask static files with url_for?

To add a link to Python Flask static files with url_for, we can call it with the view name and the URL parameters.

For instance, we write

url_for('static', filename='path/to/file')

to call url_for with the name of the endpoint and the URL parameter filename‘s value respectively.

Conclusion

To add a link to Python Flask static files with url_for, we can call it with the view name and the URL parameters.