Use the start command in the script :
@echo off
start python xxx.py
Note:
start command: Start a separate "command prompt" window to run the specified program or command. If used without parameters,
start will open a second command prompt window.
Use the following parameters:
/b It is not necessary to open a new "Command Prompt" window when starting the application.
E.g:
start /b D:\apache-jmeter-4.0\bin\batchExecute\switchtoDC1999.py