Skip to main content

Read/rewrite/write Python ASTs

Project description





3-clause BSD

Build status:
Travis CI

astor is designed to allow easy manipulation of Python source via the AST.

There are some other similar libraries, but astor focuses on the following areas:

  • Round-trip an AST back to Python [1]:

    • Modified AST doesn’t need linenumbers, ctx, etc. or otherwise be directly compileable for the round-trip to work.

    • Easy to read generated code as, well, code

    • Can round-trip two different source trees to compare for functional differences, using the astor.rtrip tool (for example, after PEP8 edits).

  • Dump pretty-printing of AST

    • Harder to read than round-tripped code, but more accurate to figure out what is going on.

    • Easier to read than dump from built-in AST module

  • Non-recursive treewalk

    • Sometimes you want a recursive treewalk (and astor supports that, starting at any node on the tree), but sometimes you don’t need to do that. astor doesn’t require you to explicitly visit sub-nodes unless you want to:

    • You can add code that executes before a node’s children are visited, and/or

    • You can add code that executes after a node’s children are visited, and/or

    • You can add code that executes and keeps the node’s children from being visited (and optionally visit them yourself via a recursive call)

    • Write functions to access the tree based on object names and/or attribute names

    • Enjoy easy access to parent node(s) for tree rewriting

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

astor-0.8.1.tar.gz (35.1 kB view hashes)

Uploaded Source

Built Distribution

astor-0.8.1-py2.py3-none-any.whl (27.5 kB view hashes)

Uploaded Python 2 Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page