assert b"\r\n" in b"Hello\r\nWorld"

assert b"\r\n\r\n" in b"Hello\r\n\r\nWorld"

assert not (b"\r\n\r\n" in b"Hello\r\nWorld")

assert not (b"\r\n\r\n" in b'\x43\x6f\x6e\x6e\x65\x63\x74\x69\x6f\x6e\x3a\x20\x63\x6c\x6f\x73\x65\x0d\x0a\x43\x6f\x6e\x74\x65\x6e\x74\x2d\x4c\x65\x6e\x67\x74\x68\x3a\x20\x39\x34\x31\x32\x0d\x0a\x41\x63\x63\x65\x70\x74\x2d\x52\x61\x6e\x67\x65\x73\x3a\x20\x62\x79\x74\x65\x73\x0d\x0a\x43\x61\x63\x68\x65\x2d\x43\x6f\x6e\x74\x72\x6f\x6c\x3a\x20')


def test():
    a = bytes(10)
    a[1] = 1
    return a


print(test())
res = test()