更强更方便的进制转换工具

最近，我仿照https://blog.csdn.net/Eyizoha/article/details/94897931?locationNum=9&fps=1上的2-36进制转换的代码做出了一个更强的2-62进制转换工具，不仅可以进行普通的进制转换，还可以直接进行不同进制计算，代码如下（Python3）：

from decimal import *
getcontext().prec = 1000
def trans(num):	# 输入数字换为字母或输入字母转换为数字
    if type(num) == int:
        if num < 10:
            return str(num)
        elif num < 36:
            return chr(ord('a') + num - 10)
        else:
            return chr(ord('A') + num - 36)
    else:
        if num.isdigit():
            return int(num)
        elif num.islower():
            return ord(num) - ord('a') + 10
        elif num.isupper():
            return ord(num) - ord('A') + 36

def check(num, base, target): # 待转换数字，当前进制，目标进制
    if type(base) is not int or base < 2 or base > 62 or type(target) is not int or target < 2 or target > 62:
        print('非法进制数！')
        return False
    if type(num) is int or type(num) is Decimal:
        num = str(num)
    elif type(num) is str and len(num) != 0:
        num = num
    else:
        print('非数字输入！')
        return False

    if num.count('.') > 1:
        print('多个小数点！')
        return False

    if not num.replace('.', '').isalnum():
        print('含有其他字符！')
        return False

    for c in num.replace('.', ''):
        if trans(c) >= base:
            print('字符超过进制允许！')
            return False

    while len(num) > 1:
        if num[0] == '0' and num[1] != '.':
            num = num[1:]
        else:
            break
    return num

def basechange(num, base, target, precision=8): # 待转换数字，当前进制，目标进制，精度
    num = check(num, base, target)
    if num is False:
        return None
    point = num.find('.')
    if point == -1:
        point = len(num)
    radix = num.replace('.', '')
    if target == 10:
        int_part = radix[:point][::-1]
        frac_part = radix[point:]
        s = 0
        ss = 0
        for i in range(len(int_part)):
            s += trans(int_part[i]) * base ** i
        for i in range(len(frac_part)):
            ss += trans(frac_part[i]) / base ** (i+1)
        return str(s) + str(ss)[1:]
    elif base == 10:
        int_part = int(radix[:point])
        frac_part = Decimal('0.'+radix[point:])
        s = ''
        while True:
            s += trans(int_part % target)
            int_part //= target
            if int_part == 0:
                break
        s = s[::-1]
        if frac_part != 0:
            s += '.'
            ct = 0
            while frac_part != 0 and ct < precision:
                frac_part *= target
                s += trans(int(frac_part))
                frac_part -= int(frac_part)
                ct += 1
        return s
    else:
        return basechange(basechange(num, base, 10, precision=precision), 10, target, precision=precision)

def abpl(num1,base1,num2,base2,target):
    a,b=basechange(num1, base1, 10, 1000),basechange(num2, base2, 10, 1000)
    return basechange(Decimal(a)+Decimal(b),10,target,1000) #加法

def absu(num1,base1,num2,base2,target):
    a,b=basechange(num1, base1, 10, 1000),basechange(num2, base2, 10, 1000)
    return basechange(Decimal(a)-Decimal(b),10,target,100) #减法

def abmu(num1,base1,num2,base2,target):
    a,b=basechange(num1, base1, 10, 1000),basechange(num2, base2, 10, 1000)
    return basechange(Decimal(a)*Decimal(b),10,target,100) #乘法

def abdi(num1,base1,num2,base2,target):
    a,b=basechange(num1, base1, 10, 1000),basechange(num2, base2, 10, 1000)
    return basechange(Decimal(a)/Decimal(b),10,target,100) #除法

def abpo(num1,base1,num2,base2,target):
    a,b=basechange(num1, base1, 10, 1000),basechange(num2, base2, 10, 1000)
    return basechange(Decimal(a)**Decimal(b),10,target,100) #乘方

def abrt(num1,base1,num2,base2,target):
    a,b=basechange(num1, base1, 10, 1000),basechange(num2, base2, 10, 1000)
    return basechange(Decimal(a)**Decimal(1/Decimal(b)),10,target,100) #开方

def abfl(num1,base1,num2,base2,target):
    a,b=basechange(num1, base1, 10, 1000),basechange(num2, base2, 10, 1000)
    return basechange(Decimal(a)//Decimal(b),10,target,100) #除法

以下是演示：

abpo(2,10,100,10,62)
'qADiGrP0AKRA2S8Uw'
abmu('acc',62,'python',62,10)
'917683977345620'
abrt(2,10,100,10,62)
'1.0qJHxLPX0S8850kC42G0iHHAWSopXPjVS0okYnGj5tINlPl6xyZ7j4nBqCcrjw7q5Stze0ppJMJ5rGcETWKEqsZMjj80gBUIqTke'

但存在一些缺陷，例如：

abpo('gig',62,100,62,62)
含有其他字符！
abpo(31,10,800,10,62)
含有其他字符！

这是因为当数字较大的时候，可能会使用科学计数法（有一个+号）。
希望日后可以改进。

标签：10,转换,target,Decimal,return,num,更强,basechange,进制
来源： https://blog.csdn.net/qq_34606903/article/details/113525647