问变量未更改python 3.6

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#!/usr/bin/env python

import subprocess

#variables will be imported from chef.

Desired_os='Centos7'
clonedvm='default'
New_Vm_Name = 'banana'


#function descriptors and dictionary (al this for a fucking switch statement?)

def Centos7():
    clonedvm='CentosCloneMe'
    print ("cloning Centos")
def debian():
    print("debian not yet implemented")
def manjora():
    print("manjora not yet implemented")
def ubuntu18():
    print("ubuntu18 not yet implemented")


options =  {
            'Centos7' : Centos7,
            'Debian' : debian,
            'ubuntu18' : ubuntu18,
            'manjora' : manjora,
}
#---------------------------------------------------------------------------------end of reusable switch


#enter data in switch statement
options[Desired_os]()

args = f"virt-clone -o {clonedvm} -n {New_Vm_Name} --auto-clone"

subprocess.call(args, shell=True)

[drunkenpanda@Diablo Scripts]$ sudo ./clonevm.py 
[sudo] password for drunkenpanda: 
cloning Centos
ERROR    Domain 'default' was not found.