Python: How to mmap memory that is shared with Linux Kernel?

I have a kernel module that uses shared memory to exchange data with a userspace app. I can use C to implement the userspace app and map that shared memory without any problem.

Now, when I try to use Python it always throws the error msg :

ValueError: cannot mmap an empty file

Does anyone know how to correctly handle this mapping?

Sample code:

import mmap    
import os      
     
filepath="/proc/file"        
fd = os.open(filepath, os.O_RDONLY)    
mmap_object = mmap.mmap(fd,0, mmap.MAP_SHARED,mmap.ACCESS_READ)    
  
txt=mmap_object.read()