earch 簡單的 group val class turn utf pla odin

#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = "loki"

# Usage: Make a Diy Calculator
# example:
#    ‘1 - 2 * ((60-30 +(-40/5) * (9-2*5/3+7/3*99/4*2998+10*568/14))-(-4*3)/(16-3*2))‘

import re
RE_RULE = \([^()]+\)


def arithmetical(temp):
    result = eval(temp)
    return result


def main(arithmetic):
    step = 0
    while 1:
        step += 1
        result = re.search(RE_RULE, arithmetic)
        if result:  # if exist ‘()‘
            temp_ = result.group()
            calc_res = str(arithmetical(temp_))
            arithmetic = re.sub(RE_RULE, calc_res, arithmetic)  # replace  source values
            print(arithmetic, "step: %s" % step)
        else:  # if not ‘()‘
            return arithmetical(arithmetic)


if __name__ == __main__:
print("result: %s" % (main(user_input)))

python模塊——re模塊(簡單的計算器功能實現_eval版)