pytasks

Python task execution in Go.

This project embeds Python via CGO and aims to make the Python GIL handling more straight forward.

Installation

Add the package to your go.mod file:

require github.com/nickpoorman/pytasks master

Or, clone the repository:

git clone --branch master https://github.com/nickpoorman/pytasks.git $GOPATH/src/github.com/nickpoorman/pytasks

A complete example:

mkdir pytasks-app && cd pytasks-app

cat > go.mod <<-END
  module my-dataframe-app

  require (
      github.com/nickpoorman/pytasks master
      github.com/DataDog/go-python3 master
  )
END

cat > main.go <<-END
    package main

    import (
        "github.com/DataDog/go-python3"
        "github.com/nickpoorman/pytasks"
    )

    func main() {
        py := pytasks.GetPythonSingleton()
        fooModule, err := py.ImportModule("foo")
        if err != nil {
            panic(err)
        }

        // Start task 1 - this will spawn a new goroutine
        wg1, err := py.NewTask(func() {
            odds := fooModule.GetAttrString("print_odds")
            defer odds.DecRef()

            odds.Call(python3.PyTuple_New(0), python3.PyDict_New())
        })
        if err != nil {
            panic(err)
        }

        // Start task 2 - this will spawn a new goroutine
        wg2, err := py.NewTask(func() {
            even := fooModule.GetAttrString("print_even")
            defer even.DecRef()

            even.Call(python3.PyTuple_New(0), python3.PyDict_New())
        })
        if err != nil {
            panic(err)
        }

        wg1.Wait()
        wg2.Wait()

        // At this point we know we won't need Python anymore in this
        // program, we can restore the state and lock the GIL to perform
        // the final operations before exiting.
        py.Finalize()
    }
END

go run main.go

Usage

See the task_example.go or tests and benchamrks for usage examples.

License

(c) 2019 Nick Poorman. Licensed under the Apache License, Version 2.0.