Swift framework to interact with Python.

PythonKit requires Swift 5 or higher and has been tested on macOS, Linux and Windows.

Some Python code like this:

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

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

import PythonKit letsys=tryPython.import("sys")print("Python \(sys.version_info.major).\(sys.version_info.minor)")print("Python Version: \(sys.version)")print("Python Encoding: \(sys.getdefaultencoding().upper())")

Add the following dependency to your Package.swift manifest:

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

As the Python library are loaded at runtime by PythonKit, it will try to find the most 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 $ PYTHON_VERSION=2.7 swift run [*] Python 2.7 $ PYTHON_LIBRARY=libpython3.5.so swift run [*] Python 3.5 $ PYTHON_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython2.7.so swift run [*] Python 2.7 

If PythonKit cannot find and load the Python library you can set the PYTHON_LOADER_LOGGING environment variable to know from which locations PythonKit is trying to load the library:

$ PYTHON_LOADER_LOGGING=TRUE PYTHON_VERSION=3.8 swift run Loading symbol 'Py_Initialize' from the Python library... Trying to load library at 'Python.framework/Versions/3.8/Python'... Trying to load library at '/usr/local/Frameworks/Python.framework/Versions/3.8/Python'... Fatal error: Python library not found. Set the PYTHON_LIBRARY environment variable with the path to a Python library. 

• Originally PythonKit was based on the Python module from the Swift for TensorFlow experimental project.
• If you have questions about PythonKit you can ask on the Swift Forums.