编写一个计算器软件 要求： （1）实现大数相加，相减功能 （2）能进行 2,8,10,16 进制数制转换 （3）能进行判断括号是否匹配、以及对表达式进行求值

以下是一个简单的计算器软件实现，支持大数相加、相减、2、8、10、16进制数制转换、括号匹配和表达式求值功能。

import re

# 大数相加
def add(num1, num2):
    res, carry = '', 0
    num1, num2 = num1[::-1], num2[::-1]
    for i in range(max(len(num1), len(num2))):
        n1 = int(num1[i]) if i < len(num1) else 0
        n2 = int(num2[i]) if i < len(num2) else 0
        s = n1 + n2 + carry
        res += str(s % 10)
        carry = s // 10
    if carry:
        res += str(carry)
    return res[::-1]

# 大数相减
def sub(num1, num2):
    if len(num1) < len(num2):
        num1, num2 = num2, num1
    num1, num2 = num1[::-1], num2[::-1]
    res, borrow = '', 0
    for i in range(len(num1)):
        n1, n2 = int(num1[i]), int(num2[i]) if i < len(num2) else 0
        s = n1 - n2 - borrow
        if s < 0:
            s += 10
            borrow = 1
        else:
            borrow = 0
        res += str(s)
    return res[::-1].lstrip('0')

# 10进制转其他进制
def dec2other(num, base):
    num, res = int(num), ''
    while num:
        res += str(num % base)
        num //= base
    return res[::-1]

# 其他进制转10进制
def other2dec(num, base):
    res = 0
    for i in range(len(num)):
        res += int(num[i]) * (base ** (len(num) - i - 1))
    return str(res)

# 表达式求值
def calculate(expression):
    expression = expression.replace(' ', '')
    stack_num, stack_op = [], []
    i = 0
    while i < len(expression):
        if expression[i].isdigit():
            j = i
            while j < len(expression) and expression[j].isdigit():
                j += 1
            num = expression[i:j]
            stack_num.append(num)
            i = j
        elif expression[i] == '(':
            stack_op.append('(')
            i += 1
        elif expression[i] == ')':
            while stack_op[-1] != '(':
                b, a = stack_num.pop(), stack_num.pop()
                op = stack_op.pop()
                stack_num.append(str(eval(a + op + b)))
            stack_op.pop()
            i += 1
        else:
            while stack_op and stack_op[-1] != '(' and \
                  ((expression[i] in '+-' and stack_op[-1] in '+-') or \
                   (expression[i] in '*/' and stack_op[-1] in '*/')):
                b, a = stack_num.pop(), stack_num.pop()
                op = stack_op.pop()
                stack_num.append(str(eval(a + op + b)))
            stack_op.append(expression[i])
            i += 1
    while stack_op:
        b, a = stack_num.pop(), stack_num.pop()
        op = stack_op.pop()
        stack_num.append(str(eval(a + op + b)))
    return stack_num[0]

# 括号匹配
def brackets_match(expression):
    stack = []
    for ch in expression:
        if ch == '(':
            stack.append(ch)
        elif ch == ')':
            if not stack:
                return False
            stack.pop()
    return not stack

# 主函数
def main():
    while True:
        print('=' * 30)
        print('请选择功能：')
        print('1. 大数相加')
        print('2. 大数相减')
        print('3. 进制转换')
        print('4. 表达式求值')
        print('5. 括号匹配')
        print('0. 退出')
        choice = input('请输入功能对应的数字：')
        if choice == '0':
            break
        elif choice == '1':
            num1 = input('请输入第一个数：')
            num2 = input('请输入第二个数：')
            print('结果为：', add(num1, num2))
        elif choice == '2':
            num1 = input('请输入第一个数：')
            num2 = input('请输入第二个数：')
            print('结果为：', sub(num1, num2))
        elif choice == '3':
            num = input('请输入要转换的数：')
            src_base = int(input('请输入原数的进制：'))
            dst_base = int(input('请输入目标进制：'))
            if src_base != 10:
                num = other2dec(num, src_base)
            if dst_base == 10:
                print('结果为：', num)
            else:
                print('结果为：', dec2other(num, dst_base))
        elif choice == '4':
            expression = input('请输入要求值的表达式：')
            print('结果为：', calculate(expression))
        elif choice == '5':
            expression = input('请输入要检查的表达式：')
            if brackets_match(expression):
                print('括号匹配')
            else:
                print('括号不匹配')
        else:
            print('输入有误，请重新输入！')

if __name__ == '__main__':
    main()

该计算器软件通过命令行与用户交互，并提供了简单的菜单选择功能。用户可以根据自己的需求选择相应的功能。