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clpython

Implementation of Python in Common Lisp for seamless integration and experimentation.

Status
UnmaintainedNo commits in 1629 days.
Last checked
Checked · Oct 14, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

clpython is an implementation of the Python programming language written in Common Lisp. It allows developers to leverage both Python's extensive libraries and Common Lisp's powerful features, making it ideal for those interested in exploring the intersection between these two languages.

clpython uniquely allows developers and researchers to work seamlessly between Python and Common Lisp, offering an unparalleled opportunity for experimentation and integration across these two languages.

When it fits — and when it doesn’t

A good fit for

  • Developers who need to integrate Python libraries into their Common Lisp projects without rewriting them.

  • Educators teaching both Python and Common Lisp, looking for tools that bridge the two languages.

Look elsewhere if

  • Projects requiring high performance where language interoperability overhead is unacceptable.

  • Teams working exclusively in either Python or Common Lisp without a need to integrate with the other.

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Limited community support and documentation

    clpython has a small user base, leading to limited resources for troubleshooting and learning.

  2. 02

    Performance overhead due to language interoperability

    The process of translating between Python and Common Lisp can introduce significant performance penalties in certain use cases.

  3. 03

    Incomplete Python library support

    Not all Python libraries are fully supported or may require additional effort to integrate with clpython.

What it does well

  • Seamless integration of Python and Common Lisp environments.

  • Allows for experimentation with both languages' features in a single project.

  • Facilitates the use of Python libraries within Common Lisp applications.

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up clpython

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →
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