PythonKit

Swift framework to interact with Python.

Requirements

PythonKit requires a recent Swift 4.2 toolchain and has been tested both on macOS and Linux.

Build

PythonKit can be built with Swift PM:

$ cd PythonKit
$ swift run
[*] Python 3.7
[ ] Version: 3.7.0

The Python library will be loaded at runtime, PythonKit will try to find the more modern Python version available in the system. You can force a given version with the PYTHON_VERSION environment variable or an specific Python library path or name with PYTHON_LIBRARY.

$ PYTHON_VERSION=3 swift run
[*] Python 3.5
[ ] Version: 3.5.2
$ PYTHON_VERSION=2.7 swift run
[*] Python 2.7
[ ] Version: 2.7.10
$ PYTHON_LIBRARY=libpython3.5.so swift run
[*] Python 3.5
[ ] Version: 3.5.2
$ PYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython2.7.so swift run
[*] Python 2.7
[ ] Version: 2.7.10

NOTE: On macOS, if you use a Python version from Homebrew, link its framework to /Library/Frameworks or set the environment variable DYLD_FRAMEWORK_PATH=/usr/local/Frameworks so it can be found by the dynamic library loader.

Usage

Add the following dependency to your Swift PM Package.swift manifest:

.package(url: "https://github.com/pvieito/PythonKit.git", .branch("master")),

Example

Some Python code like this:

import sys

print(f"Python {sys.version_info.major}.{sys.version_info.minor}")
print(f"Python Version: {sys.version}")

Can be implemented in Swift through PythonKit with the following code:

import PythonKit

let sys = try Python.import("sys")

print("Python \(sys.version_info.major).\(sys.version_info.minor)")
print("Python Version: \(sys.version)")

Notes

• Python.swift is code from the Swift for TensorFlow project.