mirror of https://github.com/mitsuhiko/flask.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
34 lines
1.6 KiB
34 lines
1.6 KiB
.. _python3-support: |
|
|
|
Python 3 Support |
|
================ |
|
|
|
Flask and all of its dependencies support Python 3 so you can in theory |
|
start working on it already. There are however a few things you should be |
|
aware of before you start using Python 3 for your next project. |
|
|
|
If you want to use Flask with Python 3 you will need to use Python 3.3 or |
|
higher. 3.2 and older are *not* supported. |
|
|
|
In addition to that you need to use the latest and greatest versions of |
|
`itsdangerous`, `Jinja2` and `Werkzeug`. Flask 0.10 and Werkzeug 0.9 were |
|
the first versions to introduce Python 3 support. |
|
|
|
Some of the decisions made in regards to unicode and byte utilization on |
|
Python 3 make it hard to write low level code. This mainly affects WSGI |
|
middlewares and interacting with the WSGI provided information. Werkzeug |
|
wraps all that information in high-level helpers but some of those were |
|
specifically added for the Python 3 support and are quite new. |
|
|
|
Unless you require absolute compatibility, you should be fine with Python 3 |
|
nowadays. Most libraries and Flask extensions have been ported by now and |
|
using Flask with Python 3 is generally a smooth ride. However, keep in mind |
|
that most libraries (including Werkzeug and Flask) might not quite as stable |
|
on Python 3 yet. You might therefore sometimes run into bugs that are |
|
usually encoding-related. |
|
|
|
The majority of the upgrade pain is in the lower-level libararies like |
|
Flask and Werkzeug and not in the actual high-level application code. For |
|
instance all of the Flask examples that are in the Flask repository work |
|
out of the box on both 2.x and 3.x and did not require a single line of |
|
code changed.
|
|
|