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>>> bytes('中国', 'utf-8')
b'\xe4\xb8\xad\xe5\x9b\xbd'
>>> bytes('!@#!#!@', 'utf-8')
b'!@#!#!@'
>>> b = '0000'.encode('ascii')
>>> b.hex()
'30303030'
>>> b[0], b[1], b[2], b[3]
(48, 48, 48, 48)
>>> chr(129)
'\x81'
>>> chr(12)
'\x0c'
>>> from string import printable
>>> for c in printable: print(c, end='')
0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~