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.. _python3-support:
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Python 3 Support
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================
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Flask, its dependencies, and most Flask extensions support Python 3.
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You should start using Python 3 for your next project,
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but there are a few things to be aware of.
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You need to use Python 3.4 or higher. 3.3 and older are *not* supported.
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You should use the latest versions of all Flask-related packages.
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Flask 0.10 and Werkzeug 0.9 were the first versions to introduce Python 3 support.
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Python 3 changed how unicode and bytes are handled, which complicates how low
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level code handles HTTP data. This mainly affects WSGI middleware interacting
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with the WSGI ``environ`` data. Werkzeug wraps that information in high-level
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helpers, so encoding issues should not affect you.
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The majority of the upgrade work is in the lower-level libraries like
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Flask and Werkzeug, not the high-level application code.
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For example, all of the examples in the Flask repository work on both Python 2 and 3
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and did not require a single line of code changed.
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