# Continuation lines can be used, with a backslash as the last character on the 
# line indicating that the next line is a logical continuation of the line:

hello = "This is a rather long string containing\n\
several lines of text just as you would do in C.\n\
    Note that whitespace at the beginning of the line is\
 significant."

print hello

http://www.java2s.com/Code/Python/String/Stringliteralsspanmultiplelinesinseveralways.htm

String literals that span multiple lines

Python