python subprocess

ideas to run the code and application in different process

Subprocess:

The subprocess is a module available in python language where new code and applications can be run. It has the flexibility to start a new application from python program itself. It can solve different problem we programmer come across. We can run different programs including C programs too. It returns the exit codes, inputs and outputs .

Starting a subprocess in python ?

To start a new process, you can use Popen function. The args includes program you want to start, second is file.

from subprocess import Popen, PIPE
process = Popen(['cat', 'main.py'], stdout=PIPE, stderr=PIPE)
stdout, stderr = process.communicate()
print(stdout)

Calling the above will run the command and print the exit code and outputs.

All Together, the command for running a simple .java file using subprocess

class Hello{
public static void main(String args[]){
System.out.print("Java says Hello World!");
}
}

Running with py

import subprocess
import os
def Java_Execution():
# storing the output
s = subprocess.check_output("javac Hello.java;java Hello", shell = True)
print(s.decode("utf-8"))
# Driver functions
if __name__=="__main__":
Java_Execution()

The above code will run .java file and print output.