Here backslash \ is the line continuation character the error message is talking about, and after it, only newline characters/whitespace are allowed
print "This is a very long string that doesn't fit" + \
"on a single line"
Outside of a string, a backslash can only appear in this way. For division, you want a slash: /.
If you want to write a verbatim backslash in a string, escape it by doubling it: "\\"