diff --git a/code/04/control_flow.ipynb b/code/04/control_flow.ipynb new file mode 100644 index 0000000..27f9c9c --- /dev/null +++ b/code/04/control_flow.ipynb @@ -0,0 +1,535 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "source": [ + "# 控制流" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%% md\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 17, + "metadata": { + "collapsed": true + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "let's go to the park.\n" + ] + } + ], + "source": [ + "today_weather = \"sunny\"\n", + "\n", + "if today_weather == \"sunny\":\n", + " print(\"let's go to the park.\")\n", + "else:\n", + " print(\"I can't get out of bed.\")" + ] + }, + { + "cell_type": "code", + "execution_count": 18, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "let's go to the park.\n" + ] + } + ], + "source": [ + "today_weather = \"sunny\"\n", + "\n", + "if today_weather == \"sunny\":\n", + " print(\"let's go to the park.\")\n", + "elif today_weather == \"rainy\":\n", + " print(\"I can't go to the park.\")\n", + "elif today_weather == \"cloudy\":\n", + " print(\"Maybe we can go to park?\")\n", + "elif today_weather == \"snowy\":\n", + " print(\"Should we stay at home?\")\n", + "else:\n", + " print(\"Ok, I don't know what to do.\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 19, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "let's go to the park.\n" + ] + } + ], + "source": [ + "today_weather = \"sunny\"\n", + "\n", + "if today_weather == \"sunny\":\n", + " print(\"let's go to the park.\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 20, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "`message` string can be printed?\n" + ] + } + ], + "source": [ + "\n", + "# default value\n", + "empty = \"\"\n", + "names = []\n", + "message = \"You got!\"\n", + "\n", + "if empty:\n", + " print(\"`empty` string variable can be printed?\")\n", + "elif names:\n", + " print(\"`names` list can be printed?\")\n", + "elif message:\n", + " print(\"`message` string can be printed?\")\n", + "else:\n", + " print(\"Nothing is printed\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 21, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Got 7, over.\n" + ] + } + ], + "source": [ + "# complicated if-else\n", + "\n", + "import random\n", + "\n", + "num = random.randrange(1, 10)\n", + "target = [2, 8, 10]\n", + "\n", + "if (num % 2 == 0) or (num in target):\n", + " print(f\"{num} is target num.\")\n", + "elif num ** 3 == 9:\n", + " print(f\"num is 3.\")\n", + "else:\n", + " print(f\"Got {num}, over.\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 循环遍历" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%% md\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 22, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "iterate message: H/e/l/l/o/,/ /w/o/r/l/d\n", + "iterate os: Windows/macOS/Android/Linux/iOS/iPadOS\n" + ] + } + ], + "source": [ + "from collections import Iterable\n", + "\n", + "message = \"Hello, world\"\n", + "if isinstance(message, Iterable):\n", + " print(\"iterate message: \", end=\"\")\n", + " print(*message, sep=\"/\")\n", + "\n", + "os = [\"Windows\", \"macOS\", \"Android\", \"Linux\", \"iOS\", \"iPadOS\"]\n", + "if isinstance(os, Iterable):\n", + " print(\"iterate os: \", end=\"\")\n", + " print(*os, sep=\"/\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "## for-loop" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%% md\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 23, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "1: 1*1=1 \n", + "2: 1*2=2 2*2=4 \n", + "3: 1*3=3 2*3=6 3*3=9 \n", + "4: 1*4=4 2*4=8 3*4=12 4*4=16 \n", + "5: 1*5=5 2*5=10 3*5=15 4*5=20 5*5=25 \n", + "6: 1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36 \n", + "7: 1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49 \n", + "8: 1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64 \n", + "9: 1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81 \n" + ] + } + ], + "source": [ + "for outer in range(1, 10):\n", + " print(f\"{outer}: \", end=\"\")\n", + " for inner in range(outer):\n", + " print(f\"{inner+1}*{outer}={outer*(inner+1)}\", end=\" \")\n", + " print()" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "## while-loop" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%% md\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 24, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "I can't stop!\n", + "I can't stop!\n", + "I can't stop!\n", + "I can't stop!\n", + "I can't stop!\n" + ] + } + ], + "source": [ + "cond = 5\n", + "while 1:\n", + " if cond == 0:\n", + " break\n", + "\n", + " print(\"I can't stop!\")\n", + " cond -= 1" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 25, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "output 1\n", + "output 2\n", + "output 3\n", + "output 4\n" + ] + } + ], + "source": [ + "for n in range(1, 6):\n", + " if n % 5 == 0:\n", + " break\n", + " print(f\"output {n}\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 26, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "output 1\n", + "output 3\n" + ] + } + ], + "source": [ + "for n in range(1, 4):\n", + " if n % 2 == 0:\n", + " continue\n", + " print(f\"output {n}\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 列表推导式与生成器表达式" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%% md\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 27, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "[2, 4, 6, 8, 10]\n" + ] + } + ], + "source": [ + "evens = []\n", + "for n in range(1, 11):\n", + " if n % 2 == 0:\n", + " evens.append(n)\n", + "print(evens)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 28, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "[2, 4, 6, 8, 10]\n" + ] + } + ], + "source": [ + "# list comprehension\n", + "\n", + "evens = [n for n in range(1, 11) if n % 2 == 0]\n", + "print(evens)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 29, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "[2, 4, 6, 8, 10]\n" + ] + } + ], + "source": [ + "# generator expression\n", + "\n", + "evens = list(n for n in range(1, 11) if n % 2 == 0)\n", + "print(evens)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 30, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "[2, 4, 6, 8, 10]\n" + ] + } + ], + "source": [ + "# better or not?\n", + "# comprehension way\n", + "\n", + "arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9, 10]]\n", + "\n", + "evens = [n for inner in arr for n in inner if n % 2 == 0]\n", + "print(evens)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 31, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "[2, 4, 6, 8, 10]\n" + ] + } + ], + "source": [ + "# native for-loop\n", + "\n", + "arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9, 10]]\n", + "evens = []\n", + "for inner in arr:\n", + " for n in inner:\n", + " if n % 2 == 0:\n", + " evens.append(n)\n", + "print(evens)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 31, + "outputs": [], + "source": [], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 3", + "language": "python", + "name": "python3" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.6" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} \ No newline at end of file diff --git a/code/04/operators.ipynb b/code/04/operators.ipynb new file mode 100644 index 0000000..af3b8a9 --- /dev/null +++ b/code/04/operators.ipynb @@ -0,0 +1,672 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": { + "collapsed": true, + "pycharm": { + "name": "#%% md\n" + } + }, + "source": [ + "# 算术运算符" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "2\n" + ] + } + ], + "source": [ + "print(1 + 1)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 2, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "1\n" + ] + } + ], + "source": [ + "print(2 - 1)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 3, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "20\n" + ] + } + ], + "source": [ + "print(10 * 2)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 4, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "10.0\n" + ] + } + ], + "source": [ + "print(100 / 10)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 5, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "100\n" + ] + } + ], + "source": [ + "print(10 ** 2)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": 6, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "2\n" + ] + } + ], + "source": [ + "print(12 % 10)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 比较运算符" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%% md\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(1 == 2)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(1 != 3)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(1 > 2)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(1 >= 10)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(1 < 2)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(1 <= 10)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 位运算符" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%% md\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(f\"1 KB = {1 << 10*1} bytes\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(f\"1 MB = {1 << 10*2} bytes\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(f\"1 GB = {1 << 10*3} bytes\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "print(f\"1 TB = {1 << 10*4} bytes\")" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 赋值运算符" + ], + "metadata": { + "collapsed": false + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a = 0" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a += 1\n", + "print(a)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a -= -1\n", + "print(a)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a *= 2\n", + "print(a)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a /= 2\n", + "print(a)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a **= 2\n", + "print(a)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 逻辑运算符" + ], + "metadata": { + "collapsed": false + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "p = True\n", + "q = False" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "p and q # p 为真且 q 为真，结果为真" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "p or q # p 为真或 q 为假，结果为真" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "not p or q # 非 p 为假或 q 为假，结果为假" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "not (p and q) # 非 p 为真且 q 为真，结果为假" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 成员运算符" + ], + "metadata": { + "collapsed": false + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "numbers = [1, 2, 3, 4, 5]" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "1 in numbers" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "20 not in numbers" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "markdown", + "source": [ + "# 标识运算符" + ], + "metadata": { + "collapsed": false + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "f = None\n", + "f is None" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a = 1\n", + "b = 1\n", + "c = 2" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a is b" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "a is c" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "isinstance(a, int)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "isinstance(a, str)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + }, + { + "cell_type": "code", + "execution_count": null, + "outputs": [], + "source": [ + "isinstance(a, bool)" + ], + "metadata": { + "collapsed": false, + "pycharm": { + "name": "#%%\n" + } + } + } + ], + "metadata": { + "kernelspec": { + "display_name": "Python 3", + "language": "python", + "name": "python3" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.6" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} \ No newline at end of file