I know you can use the module os for finding out if a file (or directory, w/e) exists within a certain path, e.g.
import os
os.chdir("C:\\Users\\Casper\\Documents")
os.path.exists("file_name.png")
and if file_name.png exists, it will return True. However, how do I check if the file exists just anywhere on the computer. This could be helpful for apps compiled to .exe files that others may use, where the app searches for this one file instead of going into directories and such.