Use Python built-in modules and functions to convert numbers in different hexadecimal formats

This article mainly introduces how to use Python built-in modules and functions to convert numbers in different hexadecimal formats. Python also makes it very convenient to read pure binary files. For more information, see Binascii module:
It contains a function that converts binary values into hexadecimal values, which can also be converted in turn. # Binary_value is a binary value, not a string or 1010 of the int type.

Binascii. b2a_hex (binary_value) # binary_value can be obtained by reading binary files> '89'
  
 

Builtin functions provided by python:
Bin (num) decimal value ===" binary string

bin(10)  >> '0b1010' 
  
 

Oct (num) decimal value ===" octal string

oct(10)  >>'012' 
  
 

Hex (num) decimal value ===" hexadecimal string

hex(20)  >>'0x14' 
  
 

Int (str, base) Other hexadecimal string = "decimal value. base indicates the hexadecimal value of str. If it is 2, str is binary, the default base is decimal.

int('20') >>20 
 
   int('10', 2) >>2 
  
    int('10', 8) >>8 
   
     int('20', 10) >>20 
    
      int('20',16) >>32 
      
     
    
   
  
 

Character and number conversion functions:
Chr (int) integer to character

chr(65)  >>'A', 
  
 

Ord (chr) character to integer

ord('a')  >>97, 
  
 

Finally, an example of reading the binary content of an image file is provided:

#! /Usr/bin/env python # encoding: UTF-8 import binascii fh = open (r 'C: \ Temp \ img \ 2012517165556.png ', 'rb') a = fh. read () # print 'raw: ', 'A', type (a) hexstr = binascii. b2a_hex (a) # obtain a hexadecimal number # print 'hex: ', hexstr, type (hexstr) bsstr = bin (int (hexstr, 16) [2:] print 'bin: ', bsstr, type (bsstr)

Why is the screen-flushing effect a little tricky?