import os import os.path s = 0 for (r,d,f) in os.walk('.'): for fi in f: fs = os.path.getsize(os.path.join(r,fi)) if fs > s: s = fs print('{:1.2f}'.format(s/1024**3)) code example

Example: python join paths

import os

# Join paths using OS import. Takes any amount of arguments
path = os.path.join('/var/www/public_html', './app/', ".\\my_file.json")

print(path) # /var/www/public_html/app/myfile.json