python3 byte,int,str转换

 1 # bytes 与 int
 2 b=b‘\x01\x02‘
 3 num=int.from_bytes(b,‘little‘)
 4 print(‘bytes转int：‘,num)
 5 
 6 b1=num.to_bytes(2,‘little‘)
 7 print(‘int转bytes：‘,b1)
 8 
 9 #bytes 与十六进制string
10 hs=‘‘.join([‘%02X‘ %x  for x in b])
11 print(‘bytes转十六进制字符串：‘,hs)
12 bs=bytes.fromhex(hs)
13 print(‘十六进制字符串转bytes：‘,bs)
14 # print(bytes.fromhex(hex(78)[2:]))
15 
16 #int 与 string
17 s=‘abcd‘
18 num=int(s,16)
19 print(‘字符串转int：‘,num)
20 print(‘int转十六进制字符串：‘,hex(num))