# The r means that the string is to be treated as a raw string, which means all escape codes will be ignored. 
# For an example: '\n' will be treated as a newline character, while r'\n' will be treated as the characters \ followed by n .

>>> print("{}\n{}".format("a", "b"))
a
b


>>> print(r"{}\n{}".format("a", "b"))
a\nb