unicodeescape' codec can't decode bytes in position 2-3 truncated python code example

Example 1: SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 15-16: truncated \UXXXXXXXX escape

"c:\\user\\path\\to\\file"
r"c:\user\path\to\file
# this happens because \u is the default escape code for unicode and is fixed
# either by using double slashes (no \u anymore) or converting to raw string

Example 2: SyntaxError: (unicode error) 'unicodeescape' codec can't decode bytes in position 5-6: truncated \UXXXXXXXX escape

#With 'r' works very well. For example:
print(r"C:\Users\Eric\Desktop\beeline.txt")