Typically, backslashes are seen only as part of escape sequences. Therefore, the use of a backslash outside of a raw string or escape sequence looks suspiciously like a broken escape sequence.
Characters recognized as escape-able are: abfnrtvox\'"
s = "Hello \world." t = "Nice to \ meet you" u = "Let's have \ lunch"
s = "Hello world." t = "Nice to \\ meet you" u = r"Let's have \ lunch" // raw string