python bytes、int、str、float互轉

1.bytes轉化為int

　　函數格式：int.from_bytes(bytes, byteorder, *, signed=False)

　　

s1 = b'\xf1\xff'
print(int.from_bytes(s1, byteorder='big', signed=False))
print(int.from_bytes(s1, byteorder='little', signed=True))

　　運行結果：

F:\dev\python\python.exe F:/pyCharm/L02_Test/L02Interface/L02_Common/try_demo2.py
61951
-15

Process finished with exit code 0

2.bytes轉化為str

　　str(bytes,[encoding,error])

　　decode(encoding)(python3)

　　

b=b"hell0 world"
print('bytes --> str')
print(str(b, encoding="utf-8"))
print(str(b))    #默認utf8編碼

　　運行結果：

F:\dev\python\python.exe F:/pyCharm/L02_Test/L02Interface/L02_Common/try_demo2.py
bytes --> str
hell0 world
b'hell0 world'

Process finished with exit code 0

　3. int轉為bytes

n=46000
print(n.to_bytes(length=2,byteorder='big',signed=False))