os.path.join - errors out

[tester_V]

Hi,
I'm trying to use 'os.walk' to find all the subdirectories and files in the root dir.
In the first "for" loop, the code generates an error if I use:

os.path.join(root, dirs)

to get rid of an error I'm using a workaround :

root+'\\'+dr

I understand 'workaround' is not a good thing to use.
Here is the code.

import os
p = 'c:\\02'

for root, dirs, files in os.walk(p):
    for dr in dirs :
        #r = os.path.join(root, dirs)
        #print ("Dir/Path -- ", r)
        dp = root+'\\'+dr
        print (dp)
    for file in files:
        rf = os.path.join(root, file)
        print ('Roor+file-->> ',rf)

Any help is appriciated!
Thank you.