{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "1. 计算日平均气温"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "13.25\n",
      "13.25\n"
     ]
    }
   ],
   "source": [
    "t_Day = [10, 13, 18, 12]\n",
    "#方法1：使用算术表达式\n",
    "avg = (t_Day[0] + t_Day[1] + t_Day[2] + t_Day[3]) / 4\n",
    "print(avg)\n",
    "#方法2：使用内置函数计算\n",
    "avg = sum(t_Day) / len(t_Day)\n",
    "print(avg)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "2. 计算月平均气温"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "31.677419354838708\n",
      "31.677419354838708\n"
     ]
    }
   ],
   "source": [
    "t_Day = [34,32,33,33,35,36,36,36,35,34,33,32,32,32,31,32,32,30,31,30,30,31,32,29,27,29,31,32,30,26,26] \n",
    "#下标访问方法\n",
    "s = 0\n",
    "n = 0\n",
    "for i in range(len(t_Day)):\n",
    "    s = s + t_Day[i]\n",
    "    n = n + 1\n",
    "avg = s / n \n",
    "print(avg)\n",
    "#序列迭代访问方法\n",
    "s = 0\n",
    "n = 0\n",
    "for x in t_Day:\n",
    "    s = s + x \n",
    "    n = n + 1 \n",
    "avg = s / n \n",
    "print(avg)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "3.使用用户自定义函数计算平均值"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "31.677419354838708\n"
     ]
    }
   ],
   "source": [
    "def getAvg(L):\n",
    "    return sum(L) / len(L)\n",
    "avg = getAvg(t_Day)\n",
    "print(avg)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "4.读取文件中的数据到列表"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "['34\\n', '32\\n', '33\\n', '33\\n', '35\\n', '36\\n', '36\\n', '36\\n', '35\\n', '34\\n', '33\\n', '32\\n', '32\\n', '32\\n', '31\\n', '32\\n', '32\\n', '30\\n', '31\\n', '30\\n', '30\\n', '31\\n', '32\\n', '29\\n', '27\\n', '29\\n', '31\\n', '32\\n', '30\\n', '26\\n', '26']\n",
      "[34, 32, 33, 33, 35, 36, 36, 36, 35, 34, 33, 32, 32, 32, 31, 32, 32, 30, 31, 30, 30, 31, 32, 29, 27, 29, 31, 32, 30, 26, 26]\n"
     ]
    }
   ],
   "source": [
    "L = list(open(\"201308tq.txt\"))\n",
    "print(L)\n",
    "for i in range(len(L)):\n",
    "    L[i] = int(L[i])\n",
    "print(L)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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