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A microframework based on Werkzeug, Jinja2 and good intentions
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Web development, one drop at a time

What is Flask?

Flask is a microframework for Python based on Werkzeug and Jinja2. It's intended for getting started very quickly and was developed with best intentions in mind.

Is it ready?

It's still not 1.0 but it's shaping up nicely and is already widely used. Consider the API to slightly improve over time but we don't plan on breaking it.

What do I need?

Jinja 2.4 and Werkzeug 0.7 or later. pip or easy_install will install them for you if you do pip install Flask. I encourage you to use a virtualenv. Check the docs for complete installation and usage instructions.

Where are the docs?

Go to for a prebuilt version of the current documentation. Otherwise build them yourself from the sphinx sources in the docs folder.

Where are the tests?

Good that you're asking. The tests are in the flask/testsuite package. To run the tests use the file:

$ python

If it's not enough output for you, you can use the --verbose flag:

$ python --verbose

If you just want one particular testcase to run you can provide it on the command line:

$ python test_to_run

Where can I get help?

Either use the #pocoo IRC channel on or ask on the mailinglist:

See for more resources.

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