十六进制到十进制con

Question

我怎样才能使我的程序更有效率？现在它充满了if语句。你知道吗

import copy
def hexadecimal(a):

   z = a.replace('0b','')

   y = z.rjust(8,'0')
   list1 = list(y)
   newlist = []
   for i in range(1,5):
      nig = list1.pop(0)
      newlist.append(nig)       

   if newlist == ['0','0','0','0']:
      valuenew = ''
   if newlist == ['0','0','0','1']:
      valuenew = '1'
   if newlist == ['0','0','1','0']:
      valuenew = '2'
   if newlist == ['0','1','0','0']:
      valuenew = '4'
   if newlist == ['1','0','0','0']:
      valuenew = '8'
   if newlist == ['0','0','1','1']:
      valuenew = '3'
   if newlist == ['0','1','1','1']:
      valuenew = '7'
   if newlist == ['0','1','0','1']:
      valuenew = '5'
   if newlist == ['0','1','1','0']:
      valuenew = '6'
   if newlist == ['1','0','0','1']:
      valuenew = '9'
   if newlist == ['1','0','1','0']:
      valuenew = 'A'
   if newlist == ['1','0','1','1']:
      valuenew = 'B'
   if newlist == ['1','1','0','0']:
      valuenew = 'C'
   if newlist == ['1','1','0','1']:
      valuenew = 'D'
   if newlist == ['1','1','1','0']:
      valuenew = 'E'
   if newlist == ['1','1','1','1']:
      valuenew = 'F'

   if list1 == ['0','0','0','0']:
      valuenew1 = ''
   if list1 == ['0','0','0','1']:
      valuenew1 = '1'
   if list1 == ['0','0','1','0']:
      valuenew1 = '2'
   if list1 == ['0','1','0','0']:
      valuenew1 = '4'
   if list1 == ['1','0','0','0']:
      valuenew1 = '8'
   if list1 == ['0','0','1','1']:
      valuenew1 = '3'
   if list1 == ['0','1','1','1']:
      valuenew1 = '7'
   if list1 == ['0','1','0','1']:
      valuenew1 = '5'    
   if list1 == ['0','1','1','0']:
      valuenew1 = '6'    
   if list1 == ['1','0','0','1']:
      valuenew1 = '9'    
   if list1 == ['1','0','1','0']:
      valuenew1 = 'A'    
   if list1 == ['1','0','1','1']:
      valuenew1 = 'B'    
   if list1 == ['1','1','0','0']:
      valuenew1 = 'C'    
   if list1 == ['1','1','0','1']:
      valuenew1 = 'D'    
   if list1 == ['1','1','1','0']:
      valuenew1 = 'E'    
   if list1 == ['1','1','1','1']:
      valuenew1 = 'F'

   print(valuenew + valuenew1)            

a = str(bin(int(input('enter a number'))))

hexadecimal(a)

该程序仅用于将二进制文件转换为8位

Answer 1

How could I make my program more efficient?

您可以简单地使用^{}或^{}函数将整数转换为十六进制字符串：

>>> format(255, 'X')
'FF'
>>> hex(255)
'0xff'

Answer 2

Python已经为您想要的东西内置了一些东西hex()。不过，如果你执意要自己动手，我已经对你的代码做了一些调整：

（1）由于python没有switch语句，所以您最好尝试使用dict；我还介绍了一个hex_digit函数，它基本上只是引用HEX_DIGIT中需要的值（您实际上并不需要它，但如果将来需要替换它，它会抽象出该部分）

（2）为您的填充添加一些逻辑，这样它就不仅仅适用于8位长度的数字了

HEX_DIGITS = {
  '0000': '',
  '0001': '1',
  '0010': '2',
  '0011': '3',
  '0100': '4',
  '0101': '5',
  '0110': '6',
  '0111': '7',
  '1000': '8',
  '1001': '9',
  '1010': 'A',
  '1011': 'B',
  '1100': 'C',
  '1101': 'D',
  '1110': 'E',
  '1111': 'F',
}

def hex_digit(val):
  print('Converting: ' , val)
  return HEX_DIGITS.get(val, '')

def hexadecimal(a):
  z = a.replace('0b','')
  len_z = len(z)

  # Add padding if len not a factor of 4
  if len_z % 4 != 0:
    full_length = len_z + (4 - (len_z % 4))
    z = z.rjust(full_length, '0')

  split_vals = [
    hex_digit(z[idx:idx+4])
    for idx in range(0,len(z),4)
  ]
  print("Hex value: {}".format("".join(split_vals)))

a = str(bin(int(input('Enter a number: '))))

hexadecimal(a)

Answer 3

可以将表示数字的任意字符串文字转换为具有给定基数的整数，然后将该整数转换为字符串。你知道吗

>> b = '0b01001'
>> format(int(b, 2), 'X')
'9'
>> b = '1001'
>> format(int(b, 2), 'X')
'9'

---

代码

def hexadecimal(a):
    return format(bin(a, 2), 'X')  # You could also print it