{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "import re\n",
    "from decimal import Decimal\n",
    "from functools import reduce"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "def add(string):\n",
    "    while(len(re.findall(\"[+]{1}[-]?\", string)) != 0):\n",
    "        string = re.sub(\"[-]?\\d+[.]?\\d*[+]{1}[-]?\\d+[.]?\\d*\", str(\"%f\" % reduce((lambda x, y: x + y), [Decimal(i) for i in re.split(\"[+]{1}\", re.search(\"[-]?\\d+[.]?\\d*[+]{1}[-]?\\d+[.]?\\d*\", string).group())])), string, 1)\n",
    "    return string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [],
   "source": [
    "def sub(string):\n",
    "    while(len(re.findall(\"\\d+[.]?\\d*[-]{1,2}\\d+[.]?\\d*\", string)) != 0):\n",
    "        g = re.search(\"\\d+[.]?\\d*[-]{1,2}\\d+[.]?\\d*\", string).group()\n",
    "        if(re.search(\"[-]{1,2}\", g).group() == \"-\"):\n",
    "            r = re.sub(\"[-]{1}\", \"+-\", g, 1)\n",
    "            string = re.sub(g, r, string, 1)\n",
    "        elif(re.search(\"[-]{1,2}\", g).group() == \"--\"):\n",
    "            r = re.sub(\"[-]{2}\", \"+\", g, 1)\n",
    "            string = re.sub(g, r, string, 1)\n",
    "        else:\n",
    "            pass\n",
    "    return string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [],
   "source": [
    "def mul(string):\n",
    "    while(len(re.findall(\"[*]{1}[-]?\", string)) != 0):\n",
    "        string = re.sub(\"[-]?\\d+[.]?\\d*[*]{1}[-]?\\d+[.]?\\d*\", str(\"%f\" % reduce((lambda x, y: x * y), [Decimal(i) for i in re.split(\"[*]{1}\", re.search(\"[-]?\\d+[.]?\\d*[*]{1}[-]?\\d+[.]?\\d*\", string).group())])), string, 1)\n",
    "    return string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "def div(string):\n",
    "    while(len(re.findall(\"[/]{1}[-]?\", string)) != 0):\n",
    "        string = re.sub(\"[-]?\\d+[.]?\\d*[/]{1}[-]?\\d+[.]?\\d*\", str(\"%f\" % reduce((lambda x, y: x / y), [Decimal(i) for i in re.split(\"[/]{1}\", re.search(\"[-]?\\d+[.]?\\d*[/]{1}[-]?\\d+[.]?\\d*\", string).group())])), string, 1)\n",
    "    return string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [],
   "source": [
    "def exp(string):\n",
    "    while(len(re.findall(\"[\\^]{1}[-]?\", string)) != 0):\n",
    "        string = re.sub(\"[-]?\\d+[.]?\\d*[\\^]{1}[-]?\\d+[.]?\\d*\", str(\"%f\" % reduce((lambda x, y: x ** y), [Decimal(i) for i in re.split(\"[\\^]{1}\", re.search(\"[-]?\\d+[.]?\\d*[\\^]{1}[-]?\\d+[.]?\\d*\", string).group())])), string, 1)\n",
    "    return string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [],
   "source": [
    "def evaluate(string):\n",
    "    string = exp(string)\n",
    "    string = div(string)\n",
    "    string = mul(string)\n",
    "    string = sub(string)\n",
    "    print(string)\n",
    "    string = add(string)\n",
    "    return string"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "metadata": {},
   "outputs": [
    {
     "output_type": "error",
     "ename": "SyntaxError",
     "evalue": "unexpected EOF while parsing (<ipython-input-13-f9fb4aededd9>, line 1)",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-13-f9fb4aededd9>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    def parentheses(string):\u001b[0m\n\u001b[1;37m                            ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m unexpected EOF while parsing\n"
     ]
    }
   ],
   "source": [
    "def parentheses(string):"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "metadata": {},
   "outputs": [
    {
     "output_type": "stream",
     "name": "stdout",
     "text": "-158456325028528675187087900672.000000+0.8\n"
    },
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": "'-158456325028528675187087900672.000000'"
     },
     "metadata": {},
     "execution_count": 22
    }
   ],
   "source": [
    "string = \"8^32*4/-2+0.8\"\n",
    "evaluate(string)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {},
   "outputs": [],
   "source": [
    "from sympy import symbols, solve"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "metadata": {},
   "outputs": [
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": "[6]"
     },
     "metadata": {},
     "execution_count": 26
    }
   ],
   "source": [
    "x = symbols(\"x\")\n",
    "expr = x-4-2\n",
    "sol = solve(expr)\n",
    "sol"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "output_type": "stream",
     "name": "stdout",
     "text": "x - 6\n"
    }
   ],
   "source": [
    "print(expr)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "metadata": {},
   "outputs": [],
   "source": [
    "expr = \"x-4-2\""
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "metadata": {},
   "outputs": [
    {
     "output_type": "execute_result",
     "data": {
      "text/plain": "[6]"
     },
     "metadata": {},
     "execution_count": 29
    }
   ],
   "source": [
    "sol = solve(expr)\n",
    "sol"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "output_type": "stream",
     "name": "stdout",
     "text": "x-4-2\n"
    }
   ],
   "source": [
    "print(expr)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
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  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
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  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
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