Graalpython

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GraalPy is a high-performance embeddable Python 3 runtime for Java, built on GraalVM. It enables seamless integration of Python applications within Java environments and can create fast, standalone binaries.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Yes

Skill level

Technical

About

What is graalpython?

GraalPy is a high-performance, embeddable Python 3 runtime for Java, built on GraalVM. It offers low-overhead integration between Python and Java, allowing developers to use Python within Java applications on various JDKs like GraalVM JDK, Oracle JDK, or OpenJDK. GraalPy is Python 3.12 compliant and supports the Python ecosystem, with experimental support for many popular native extension modules like NumPy, PyTorch, and TensorFlow. It also runs pure Python code faster than CPython after JIT compilation and enables deploying Python applications as standalone binaries with all dependencies included. Developers can manage Python libraries' system access through GraalPy's Java-based emulation of Python OS APIs.

Best used for

Ideal for developers who need to integrate Python code into Java applications, improve the performance of Python scripts, and deploy Python applications as standalone binaries. Especially valuable for those working within the GraalVM ecosystem or requiring polyglot programming capabilities.

Common actions

embed Python in Java

accelerate Python execution

deploy Python applications

integrate Python with JVM

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Capabilities

Key features

Embed Python in Java
High-performance Python 3.12
Supports native extension modules
Faster pure Python code
Deploy standalone Python binaries
Java-based OS API emulation

Target Audience

developer

Integrations

mavengradlegithub-actions

Pricing & Plans

Open Source

Free

FAQs

What is the primary benefit of using GraalPy over CPython?

GraalPy offers high-performance execution for pure Python code, often outperforming CPython after JIT compilation. It also provides seamless, low-overhead integration with Java applications and other languages within the GraalVM ecosystem, which CPython does not natively support.

Can GraalPy replace CPython in existing projects?

In many cases, GraalPy can serve as a drop-in replacement for CPython. It supports standard Python features and package installation via pip. However, packages with C code may require compilation during installation, necessitating available build tools.

Does GraalPy support popular Python libraries like NumPy or PyTorch?

Yes, GraalPy has experimental support for many popular native extension modules, including NumPy, PyTorch, and TensorFlow. It can also run Hugging Face models like Stable Diffusion or GPT, with daily testing of top PyPI packages to ensure compatibility.

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