PyJulia

0.6.2 verified Fri May 01 auth: no python

PyJulia is a Python package that provides a bridge between Python and Julia, allowing you to call Julia functions from Python and vice versa. It integrates with IPython/Jupyter. Current version is 0.6.2, supporting Python >=3.4. Release cadence is irregular, with updates for compatibility with new Julia and Python versions.

pip install julia

Common errors

error Julia not found. Please install Julia from https://julialang.org/downloads/ ↓

cause Julia is not installed or not in PATH.

fix

Download and install Julia, then make sure julia command is accessible in your terminal/environment.

error UnicodeEncodeError: 'ascii' codec can't encode character ↓

cause PyJulia fails to encode non-ASCII characters when printing from Julia.

fix

Set environment variable PYTHONIOENCODING=utf-8

error Segmentation fault (core dumped) ↓

cause Compiled modules cache conflicts, often on first run or after Julia updates.

fix

Initialize Julia with Julia(compiled_modules=False) or clear ~/.julia/compiled

Warnings

breaking PyJulia 0.6.0 dropped support for Python 2.7. Upgrade Python to 3.x. ↓

fix Use Python 3.4+

gotcha If Julia is not installed or not in PATH, from julia import Julia will raise an error. Missing Julia installation is the most common issue. ↓

fix Install Julia from julialang.org/downloads/ and ensure julia command is available in your terminal.

gotcha On Windows, compiled_modules=True (default) may cause segfaults. It is recommended to use compiled_modules=False if you encounter crashes. ↓

fix Initialize Julia with Julia(compiled_modules=False)

deprecated The function julia.install() is no longer needed in recent versions; PyJulia automatically installs the required Julia package PyCall.jl when first used. ↓

fix Do not call julia.install(). Just import and use Julia().

Imports

Julia
wrong
```
from julia.core import Julia
```
correct
```
from julia import Julia
```
Public API is from julia import Julia. Direct import of core is discouraged and may break.
Main
```
from julia import Main
```

Quickstart

Initialize Julia and call a Julia function. Note: compiled_modules=False is often needed on first run to avoid segfaults.

from julia import Julia
js = Julia(compiled_modules=False)
from julia import Base
Base.println("Hello from Julia")