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Python

• https://docs.python.org/3/reference/lexical_analysis.html#string-and-bytes-literals

• Bytes literals are always prefixed with 'b' or 'B'; they produce an instance of the bytes type instead of the str type. They may only contain ASCII characters; bytes with a numeric value of 128 or greater must be expressed with escapes.

  bytesliteral   ::=  bytesprefix(shortbytes | longbytes)
  bytesprefix    ::=  "b" | "B" | "br" | "Br" | "bR" | "BR" | "rb" | "rB" | "Rb" | "RB"