在Raspberry Pi Web服务器中从Web运行python脚本

I have a python script that picks an URL as parameter and it fetch some data (normally it takes 30 seconds to finish) and creates a file with it. What I want is to be able to call the script from a web (I thought about doing it with PHP but i don't mind) and just get the file path (which is printed at the begining of the script process) and leave the script running in background.I have a python script that picks an URL as par