How to extract directory name or file location from filepath

If you have a file name file1.txt in location /root/pythoneasy/, then the absolute path of the file is /root/pythoneasy/file1.txt

import os
directory_name =  os.path.dirname('/root/pythoneasy/file1.txt') 
print(directory_name ) # will print '/root/pythoneasy'

/root/pythoneasy

If the relative path will be used i.e. '../pythoneasy/file1.txt', it will print relative path not absolute path

import os
directory_name =  os.path.dirname('../pythoneasy/file1.txt')
print(directory_name)  # will print '../pythoneasy'

../pythoneasy