Python with Go #Python

何番煎じかわからないが、Golangで書いたパッケージをPython(多言語)から利用

1.構成

Python : 2.7
Golang : 1.7
OS : CentOS release 6.8
Memory : 2048MB
CPU : 3core

PythonLibrary
ctypes

2. 準備

fib.go

package main

import "C"

//export fib
func fib(n uint) uint {
    if n <= 1 {
        return n
    }
    return fib(n-1) + fib(n-2)
}

func main() {}

build
go build -o fib.so -buildmode=c-shared fib.go

fib_go.py

from ctypes import *

lib = cdll.LoadLibrary("./fib.so")

## arg
lib.fib.argtypes = [c_longlong]
## return
lib.fib.restype = c_longlong
print "fib  %d" % lib.fib(40)

fib.py

#!/usr/bin/env python

def fib(n):
    if n <= 1:
        return n
    else:
        return fib(n-1) + fib(n-2)

print(fib(40))

3.計測

fib_go.py

#time python fib_go.py
fib  102334155

real    0m1.171s
user    0m1.105s
sys 0m0.071s

fib.py

#time python fib_go.py
102334155

real    0m46.598s
user    0m46.449s
sys 0m0.030s