import os def rename(directory): for name in os.listdir(directory): print(name) os.rename(name,\"0\"+name) path = input(\"Enter the file path\
As written you're looking for a file named 0.jpg in the working directory. You want to be looking in the directory you pass in.
0.jpg
So instead do:
os.rename(os.path.join(directory,name), os.path.join(directory,'0'+name))