To Concatenate The Last byte of the bytes string to the end of the string
When you index with a single value (rather than a slice), you get an integer, rather than a length-one bytes instance.
Bytes Constructor Trick
bytes(20) doesn't give you "0x14" as you think
it's b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
How let it give you "0x14"
bytes({20})
why?
you send the constructor a set(a iterable) bytes works dealing iterable,but remember set is unorderable
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