Raw text string
A raw text string is a sequence of zero or more characters delimited by triple quotes. Any character, including whitespaces, comments, and newlines, can be part of a raw text string.
Grammar for raw text string
raw-text-string:
''' raw-textopt '''
raw-text:
raw-char
raw-text raw-char
raw-char:
any character
Warning
Even though any sequence of characters could be raw text,
one should avoid using triple qoutes (''')
as they will be interpreted as the delimiters of the raw text string.