Python

Unicode error 'unicodeescape' codec can't decode bytes in position 2-3: truncated UXXXXXXXX escape

Unicode error 'unicodeescape' codec can't decode bytes in position 2-3: truncated UXXXXXXXX escape, someone asked me to explain?
This program is to get the size of a certain file, take the .jpg file on disk C as an example, the size is 264887 bytes.
import os
statinfo = os.stat("C:\Users\Mafaza\Pictures\Saved Pictures\bg.jpg")
print(statinfo.st_size)
After running the python program. I got this following error. 
"SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 2-3: truncated \UXXXXXXXX escape" 

TO RESOLVE THIS ERROR:

First Method: 

Just add 'r' prefix before the string.

statinfo = os.stat(r"C:\Users\Mafaza\Pictures\Saved Pictures\bg.jpg")

Second Method:

Put 'double slash'

statinfo = os.stat("C:\\Users\Mafaza\\Pictures\\Saved Pictures\\bg.jpg")

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