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| 1 | +{ |
| 2 | + "cells": [ |
| 3 | + { |
| 4 | + "cell_type": "markdown", |
| 5 | + "metadata": {}, |
| 6 | + "source": [ |
| 7 | + "# 1. 变量" |
| 8 | + ] |
| 9 | + }, |
| 10 | + { |
| 11 | + "cell_type": "code", |
| 12 | + "execution_count": 1, |
| 13 | + "metadata": {}, |
| 14 | + "outputs": [ |
| 15 | + { |
| 16 | + "name": "stdout", |
| 17 | + "output_type": "stream", |
| 18 | + "text": [ |
| 19 | + "Hello World\n" |
| 20 | + ] |
| 21 | + } |
| 22 | + ], |
| 23 | + "source": [ |
| 24 | + "message = \"Hello World\"\n", |
| 25 | + "print(message)" |
| 26 | + ] |
| 27 | + }, |
| 28 | + { |
| 29 | + "cell_type": "markdown", |
| 30 | + "metadata": {}, |
| 31 | + "source": [ |
| 32 | + "这里message为一个变量,与字符串"Hello World"关联在一起。\n", |
| 33 | + "- 变量名只能包含字母、数字和下划线,变量名可以字母或下划线开头,但不能以数字开头。\n", |
| 34 | + "- 变量名不能包含空格,但可以使用下划线分隔其中单词。\n", |
| 35 | + "- 不能将Python关键字和函数名用作函数名。\n", |
| 36 | + "- 变量名应既简短又具有描述性。\n", |
| 37 | + "- 慎用小写字母l和大写字母O。 \n", |
| 38 | + "\n", |
| 39 | + "在Python中: \n", |
| 40 | + "- 变量在它第一次赋值时创建。\n", |
| 41 | + "- 变量在表达式中使用将被替换为它们的值。\n", |
| 42 | + "- 变量在表达式中使用以前必须已赋值。\n", |
| 43 | + "- 变量像对象一样不需要在一开始进行声明。\n", |
| 44 | + "\n", |
| 45 | + "Python中有三个主要类型(以及操作)的分类: \n", |
| 46 | + "- 数字(整数、浮点数、二进制、分数等) \n", |
| 47 | + " 支持加法和乘法等。 \n", |
| 48 | + "- 序列(字符串、列表、元组) \n", |
| 49 | + " 支持索引、分片和合并等。 \n", |
| 50 | + "- 映射(字典) \n", |
| 51 | + " 支持通过键的索引等。 \n", |
| 52 | + "\n", |
| 53 | + "Python中主要核心类型划分为如下两类: \n", |
| 54 | + "- **不可变类型**:数字、字符串、元组、不可变集合 \n", |
| 55 | + "- **可变类型**:列表、字典、可变集合" |
| 56 | + ] |
| 57 | + }, |
| 58 | + { |
| 59 | + "cell_type": "markdown", |
| 60 | + "metadata": {}, |
| 61 | + "source": [ |
| 62 | + "# 2. Python对象类型" |
| 63 | + ] |
| 64 | + }, |
| 65 | + { |
| 66 | + "cell_type": "markdown", |
| 67 | + "metadata": {}, |
| 68 | + "source": [ |
| 69 | + "```python\n", |
| 70 | + "# Numbers \n", |
| 71 | + "# 数字\n", |
| 72 | + "1234,3.1415,3+4j,0b111\n", |
| 73 | + "\n", |
| 74 | + "# Strings\n", |
| 75 | + "# 字符串\n", |
| 76 | + "'spam',\"Bob's\",b'a\\x01c',u'sp\\xc4m'\n", |
| 77 | + "\n", |
| 78 | + "# Lists\n", |
| 79 | + "# 列表\n", |
| 80 | + "[1,[2,'three'],4.5],list(range(10))\n", |
| 81 | + "\n", |
| 82 | + "# Dictionaries \n", |
| 83 | + "# 字典\n", |
| 84 | + "{'food':'spam','taste':'yum'},dict(hours=10)\n", |
| 85 | + "\n", |
| 86 | + "# Tuples\n", |
| 87 | + "# 元组\n", |
| 88 | + "(1,'spam',4,'U'),tuple('spam'),namedtuple\n", |
| 89 | + "\n", |
| 90 | + "# Files\n", |
| 91 | + "# 文件\n", |
| 92 | + "open('eggs.txt'),open(r'C:\\ham.bin','wb')\n", |
| 93 | + "\n", |
| 94 | + "# Sets\n", |
| 95 | + "# 集合\n", |
| 96 | + "set('abc'),{'a','b','c'}\n", |
| 97 | + "\n", |
| 98 | + "# Other core types \n", |
| 99 | + "# 其他类型\n", |
| 100 | + "Booleans,types,None\n", |
| 101 | + "\n", |
| 102 | + "# Program unit types\n", |
| 103 | + "# 程序单元类型\n", |
| 104 | + "Functions,modules,classes\n", |
| 105 | + "\n", |
| 106 | + "# Implementation-related types\n", |
| 107 | + "# 与实现相关的类型\n", |
| 108 | + "Compiled code,stack tracbacks\n", |
| 109 | + "```" |
| 110 | + ] |
| 111 | + }, |
| 112 | + { |
| 113 | + "cell_type": "code", |
| 114 | + "execution_count": null, |
| 115 | + "metadata": { |
| 116 | + "collapsed": true |
| 117 | + }, |
| 118 | + "outputs": [], |
| 119 | + "source": [] |
| 120 | + } |
| 121 | + ], |
| 122 | + "metadata": { |
| 123 | + "kernelspec": { |
| 124 | + "display_name": "Python 3", |
| 125 | + "language": "python", |
| 126 | + "name": "python3" |
| 127 | + }, |
| 128 | + "language_info": { |
| 129 | + "codemirror_mode": { |
| 130 | + "name": "ipython", |
| 131 | + "version": 3 |
| 132 | + }, |
| 133 | + "file_extension": ".py", |
| 134 | + "mimetype": "text/x-python", |
| 135 | + "name": "python", |
| 136 | + "nbconvert_exporter": "python", |
| 137 | + "pygments_lexer": "ipython3", |
| 138 | + "version": "3.6.5" |
| 139 | + } |
| 140 | + }, |
| 141 | + "nbformat": 4, |
| 142 | + "nbformat_minor": 2 |
| 143 | +} |
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