Binassii module - converting between binary and ASCII

binascii Modules contain many in binary and various ASCII A method of converting between encoded binary representations .

link ：Python Chinese document - binascii — In binary and ASCII Between | Docs4dev

• binascii.a2b_uu( * string *)

      Single line uuencoded Data is converted back to binary and binary data is returned . Except for the last line , Lines usually contain 45 individual ( Binary system ) byte . A row of data can be followed by a space .

• binascii.b2a_uu( * data *, **, *backtick=False * )

      Convert binary data to one line ASCII character , The return value is the converted row , Include line breaks . * data  The maximum length of is 45. If  backtick * by true, Then zero by '`' Instead of spaces .

• binascii.a2b_base64( * string * )

      take base64 The data block is converted back to binary and returns binary data . More than one line at a time .

• binascii.b2a_base64( * data *, **, *newline=True * )

      Use base64 Encoding converts binary data into one line ASCII character . The return value is the converted row , If * newline * by true, Include line breaks . The output of this function conforms to  RFC 3548.

• binascii.crc_hqx(* data, value *)

      Calculation * data Of 16 position CRC value , from  value  Start as initial CRC, And then return the result . This use CRC-CCITT polynomial  x*16*x*12*x*51, Usually expressed as 0x1021. this CRC With binhex4 Format use .

• binascii.crc32(* data *[,  *value *]) 

      from * value  Initial CRC Start , Calculation  data * Of 32 Bit checksums CRC-32. Default initial CRC zero . This algorithm is similar to ZIP File checksum is consistent . Since the algorithm is intended to be used as a checksum algorithm , Therefore, it is not suitable to be used as a conventional hash algorithm . Usage is as follows ：

print(binascii.crc32(b"hello world"))
# Or, in two pieces:
crc = binascii.crc32(b"hello")
crc = binascii.crc32(b" world", crc)
print('crc32 = {:#010x}'.format(crc))