python - 数字系统转换器python

Question

您好，我想制作自己的数字转换器，将二进制、八进制或十六进制的输入转换为相应的十进制值。

我必须使用 2 个单独的函数，第一个将字母数字转换为数值，然后第二个通过使用输入基数将结果转换为十进制值...

   def hexConvert (x):
    return int(x, base)

x = str(input("input value to convert to decimal: "))
base = int(input("Base of value to be converted to decimal: "))
print(x, " in base ", base, " = ", hexConvert(x), " in decimal")

我知道这很好用而且很稳健。我想通过手动操作来学习如何使用更多 Python 函数。

这是我目前拥有的:

    number = (input("Enter value to be converted to decimal: "))
base = int(input("Enter the base of the value: "))

for index in number:
    print(index)
def hexConvert(number, base):
    for number > 0:
        if number == 1:
            return 1
        if number == 2:
            return 2
        if number == 3:
            return 3
        if number == 4:
            return 4
        if number == 5:
            return 5
        if number == 6:
            return 6
        if number == "7":
            return 7
        if number == "8":
            return 8
        if number == "9":
            return 9
        if number == "A":
            return 10
        if number == "B":
            return 11
        if number == "C":
            return 12
        if number == "D":
            return 13
        if number == "E":
            return  14
        elif number == "F":
            return 15
        else:
            print(number)


nString = ""
def deciConvert(number, base):
    number = int(number)
    while number > 0:
        bString = number%base
        nString = nString + str(bString)
        number = number // base

print(deciConvert(number, base))

此时我迷失了自己，我想我还没有开始任何计算，我真的很感激任何第二意见。谢谢你!

Answer 1

我会推荐通用的 encode 和 dec_to_base 函数

ALPHABET = \
  "0123456789abcdefghijklmnopqrstuvwxyz"

def encode (n):
  try:
    return ALPHABET [n]
  except IndexError:
    raise Exception ("cannot encode: %s" % n)

def dec_to_base (dec = 0, base = 16):
  if dec < base:
    return encode (dec)
  else:
    return dec_to_base (dec // base, base) + encode (dec % base)

print (dec_to_base (9))
# 9

print (dec_to_base (10))
# a

print (dec_to_base (255))
# ff

print (dec_to_base (256))
# 100

当然它可以与其他基地一起使用

print (dec_to_base (255, base = 2))
# 11111111

print (dec_to_base (256, base = 2))
# 100000000

反转编码是通过提供同构decode 和base_to_dec

def decode (s):
  try:
    return ALPHABET.index(s)
  except ValueError:
    raise Exception ("cannot decode: %s" % s)

def base_to_dec (s, base = 16, pow = 0):
  if s is "":
    return 0
  else:
    return decode (s[-1]) * (base ** pow) + base_to_dec (s[0:-1], base, pow + 1)

print (base_to_dec ('ff'))
# 255

print (base_to_dec ('100'))
# 256

并使用不同的基础

print (dec_to_base ('11111111', base = 2))
# 255

print (dec_to_base ('100000000', base = 2))
# 256