jython how to retrieve the operating system name

Question

How to determin the underlying OS, jython is running on. Not 'java', but 'nt' or 'posix'.

• platform.platform
• os.name
• and sys.platform only return 'java'

Answer 1

For jython I use java.lang.System.getProperty("os.name"):

import sys

def get_os_version():
    ver = sys.platform.lower()
    if ver.startswith('java'):
        import java.lang
        ver = java.lang.System.getProperty("os.name").lower()
    return ver

print(get_os_version())