google-pasta
pasta is an AST-based Python refactoring library
Decision gist · record as of 2026-08-14
No. The package is abandoned (last release 2020-03-13, repository archived) with no active maintenance or security updates. While it has low install friction and permissive licensing, its pre-alpha status, known limitations, and lack of ongoing support make it unsuitable for production use. Consider it only for legacy projects already depending on it or for experimental tooling where abandonment is acceptable.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires the Python version running pasta to match the version of the code being parsed, since pasta relies on ast.parse and does not handle cross-version syntax differences.
- Low install friction with a single lightweight dependency (six).
- However, the package is abandoned—last release was 2020-03-13 and the repository is archived.
License · maintenance · safety
Apache 2.0 (permissive) — Licensed under Apache 2.0 (permissive). You may use, modify, and distribute the package freely in commercial and private projects, provided you include the license notice.
last release 2020-03-13 (2345 days) · last repo commit 2025-03-26 · 360 stars · archived
0 known vulnerabilities (OSV.dev, 2026-08-14) · 30,193,723 downloads/mo, #805 on PyPI
Alternatives
Verify before relying
import pasta
tree = pasta.parse(source_code)
# Modify tree as needed
source_code = pasta.dump(tree)- Whether the archived codebase remains compatible with Python versions beyond 3.8.
- Whether existing refactoring use cases still work reliably without active maintenance.
- Whether the symmetry guarantee (pasta.dump(pasta.parse(src)) == src) holds for all modern Python syntax.
What it is and what it does
google-pasta is an AST-based Python refactoring library that parses source code into an abstract syntax tree, allows you to modify it programmatically, and regenerates the source code with your changes applied. Its core design goal is symmetry: parsing and dumping the same code should produce identical output, preserving all original formatting and structure. It depends only on six and installs with low friction.
The package includes built-in augmentations for common refactoring tasks—primarily renaming imported names, modules, or packages throughout a codebase. It is designed for use cases like moving or renaming Python modules, enforcing coding style through AST modifications, and safely migrating code from one API to another. However, it has known limitations: it cannot change indentation levels, assumes the Python version running pasta matches the code being parsed, and does not fully support all Python features.
Use it for
- Rename imported names, modules, or packages and update all references throughout a codebase.
- Migrate code from one API to another by modifying the AST and regenerating source.
- Enforce coding style by programmatically restructuring function definitions and other AST nodes.
- Build custom refactoring tools that modify Python source while preserving original formatting.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No.
The package is abandoned (last release 2020-03-13, repository archived) with no active maintenance or security updates. While it has low install friction and permissive licensing, its pre-alpha status, known limitations, and lack of ongoing support make it unsuitable for production use. Consider it only for legacy projects already depending on it or for experimental tooling where abandonment is acceptable.
Install
google-pasta on PyPI
Before you install
Low install friction with a single lightweight dependency (six). However, the package is abandoned—last release was 2020-03-13 and the repository is archived. No active maintenance or security updates should be expected.
Requires the Python version running pasta to match the version of the code being parsed, since pasta relies on ast.parse and does not handle cross-version syntax differences.
License in practice
Licensed under Apache 2.0 (permissive). You may use, modify, and distribute the package freely in commercial and private projects, provided you include the license notice.
Quickstart
import pasta
tree = pasta.parse(source_code)
# Modify tree as needed
source_code = pasta.dump(tree)Verify before relying
- Whether the archived codebase remains compatible with Python versions beyond 3.8.
- Whether existing refactoring use cases still work reliably without active maintenance.
- Whether the symmetry guarantee (pasta.dump(pasta.parse(src)) == src) holds for all modern Python syntax.
Package facts
| License | Apache 2.0 permissive |
| Python support | Not specified |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packagesix |
| Maintenance | Abandoned 2,345 days since the last release |
| Last repo commit | repository archived |
| First released | |
| Downloads | 30,193,723 / month, #805 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 2 - Pre-AlphaLicense :: OSI Approved :: Apache Software LicenseProgramming Language :: PythonProgramming Language :: Python :: 2.7Programming Language :: Python :: 3Programming Language :: Python :: 3.4Programming Language :: Python :: 3.5Programming Language :: Python :: 3.6Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8 |
Evidence: google_pasta-0.2.0-py2-none-any.whl; google_pasta-0.2.0-py3-none-any.whl
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See also ast-decompiler · openrewrite · pyccolo · astunparse · reorder-python-imports · tokenize-rt · pyupgrade · rope · asttokens · astpretty