python类型转换

1.byte和str互转

b = b"example"    
s = "example"  
bytes(s, encoding = "utf8")  
str(b, encoding = "utf-8") 

2.byte和int互转

b=b'x01x02'
num=int.from_bytes(b,'little')
b1=num.to_bytes(2,'little')

3.byte和float互转

import struct
s=b'@zQx16'
def byteToFloat(b):
    return struct.unpack('!f',s)[0]

def floatToBytes(f):
    bs = struct.pack("f",f)
    return bytes((bs[3],bs[2],bs[1],bs[0]))
f1=byteToFloat(s)
floatToBytes(f1)

4.str和bytearray互转

str1='aaabb'
ba=bytearray(str1,encoding='utf-8')
str2=ba.decode('utf8')