The easiest way to use Flask-WeasyPrint is to install it in a Python virtual environment. When your virtual environment is activated, you can then install Flask-WeasyPrint with pip:
pip install flask_weasyprint
This will also automatically install Flask-WeasyPrint’s dependencies, Flask and WeasyPrint. Check the relative documentations if you have installationt problems with these packages.
Let’s assume you have a Flask application serving an HTML document at http://example.net/hello/ with a print-ready CSS stylesheet. WeasyPrint can render this document to PDF:
from weasyprint import HTML pdf = HTML('http://example.net/hello/').write_pdf()
WeasyPrint will fetch the stylesheet, the images as well as the document itself over HTTP, just like a web browser would. Of course, going through the network is a bit silly if WeasyPrint is running on the same server as the application. Flask-WeasyPrint can help:
from my_flask_application import app from flask_weasyprint import HTML with app.test_request_context(base_url='http://example.net/'): # /hello/ is resolved relative to the context’s URL. pdf = HTML('/hello/').write_pdf()
flask_weasyprint rather than
weasyprint, and use them from within
a Flask request context. For URLs below the
application’s root URL, Flask-WeasyPrint will short-circuit the network and
make the request at the WSGI level, without leaving the Python process.
Note that from a Flask view function you already are in a request context and
thus do not need