printing out the contents aftre subprocess.call()

[DeaD_EyE]

Maybe the java-program does not write to stdout.
Print also the stderr from the process.

If you put encoding="utf8" in the function call subprocess.run, you don't need to decode the raw bytes, then the function does it for you.
Use functions, to avoid code repetition.


Example:

#!/usr/bin/env python3
"""
Source for test.jar:
http://www.java2s.com/Code/Jar/t/Downloadtestjar.htm
"""

import subprocess


def get_int(question, allowed_values):
    while True:

        print("Please choose from", allowed_values)
        answer = input(question + ": ")

        try:
            value = int(answer)
        except ValueError:
            print("Input is not an integer")
            continue

        if value not in allowed_values:
            print(value, "is not in allowed_values")
            continue

        return value


def run_simple_client(info=False, cwd=None):
    cmd = ["java", "-jar", "test.jar"]

    if info:
        cmd.append("-info")

    return subprocess.run(cmd, capture_output=True, encoding="utf8", cwd=cwd)


def main():
    choices = (1, 2)
    choice = get_int("Please enter your choice", choices)
    print()

    if choice == 1:
        print("Without info")
        proc = run_simple_client()

    # could be an else-block, but maybe you want to extend the menu ...
    elif choice == 2:
        print("With info")
        proc = run_simple_client(info=True)

    print("stdout: ", proc.stdout.rstrip())
    print("stderr: ", proc.stderr.rstrip())
    print("returncode: ", proc.returncode)


if __name__ == "__main__":
    main()

Output:
[andre@andre-Fujitsu-i5 ~]$ LANG=C ./jj.py 
Please choose from (1, 2)
Please enter your choice: 1

Without info
stdout:  
stderr:  no main manifest attribute, in test.jar
returncode:  1

Docs:

• https://docs.python.org/3/tutorial/contr...-functions
  
• https://docs.python.org/3/tutorial/contr...s-on-loops
  
• https://docs.python.org/3/tutorial/error...exceptions
  
• https://docs.python.org/3/tutorial/datas...e-on-lists
  
• https://docs.python.org/3/library/subpro...rocess.run