convert "unspecified encoding" string to a binary string of zeros and ones : well ,i have an assignment to implement the operation modes of the DES algorithm 
in CBC mode : i am stuck at the point where the output of the encryption function gives bytes like this : b'\xe4\x06-\x95\xf5!P4' 
(i am using DES library from Crypto.Cipher)

i don't know what is that representation or how to convert it to a binary string of zeros and ones , to xor it with the 2nd plain text.

any help would be highly appreciated