如何在python中知道二进制字符串或ascii字符串

Question

I have a string variable for mac address. it can be binary - '\\x00\\x04\\x96\\x82Q\\xbb' or ascii - 'c8:be:19:c6:a0:e0'. If it is binary i need to convert it to ascii string with b2a_hex function. Is it possible to know what type of string i am having now?

Answer 1

hex(number) -> string

Return the hexadecimal representation of an integer or long integer.

//this function use to get decimal number and then using that decimal get hexadecimal number.

>>int('010110', 2)
22
>>> hex(int('010110', 2))
'0x16'
>>> 

>>> hex(int('0000010010001101', 2))
'0x48d'

Answer 2

Look at the length. If it's 6 then you have binary, if it's bigger then it's text.

if len(s) <= 6:
    s = binascii.b2a_hex(s)

Answer 3

您也可以使用简单的find 。如果string.find(":") == -1 ，则为二进制，否则为ascii。

Answer 4

Mac address is 48 bits long.

If a Mac address is presented in binary, it will take 6 bytes.( 8bit(1Byte)*6=46bits)

If a Mac address is presented in ascii, it will take 17 ASCII characters (17 bites).

So, if the data is 6 bytes, it may contain Mac address in binary. if the data is 17 bytes or more, it may contain Mac address in ASCII.