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2016.12.1 begin python basic lesson 2 notebook
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‎python_basic/python_basic_lesson_01.ipynb‎

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"source": [
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"# Lesson 1\n",
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"\n",
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"Python Basic, Lesson 11, v1.0.0, 2016.11 by David.Yi\n",
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"Python Basic, Lesson 1, v1.0.1, 2016.12 by David.Yi\n",
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"\n",
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"\n",
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"### 本次内容要点\n",

‎python_basic/python_basic_lesson_02.ipynb‎

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Lesson 2\n",
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"\n",
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"Python Basic, Lesson 2, v1.0.0, 2016.12 by David.Yi\n",
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"\n",
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"\n",
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"### 上次内容要点\n",
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"\n",
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"1.\tpython 简介\n",
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"2. 准备工作\n",
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" * 使用标准的 python 和 IDLE\n",
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" * anaconda 介绍\n",
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" * jupyter 和 notebook介绍\n",
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"2.\t基本变量概念\n",
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"3.\tprint() 和 input() 用法\n",
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"4.\tpython 开发环境介绍\n",
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" * pycharm 用法介绍\n",
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" \n",
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"### 本次内容要点\n",
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"\n",
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"* 循环语句 for 和 range() 用法\n",
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"* 常用数据类型 \n",
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" * list 用法\n",
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" * dict 用法\n",
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" * tuple 用法\n",
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"* 随机数介绍"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"Python的循环主要是for...in循环，依次把list或tuple等中的每个元素迭代出来；python 也有 while 循环，一般不常用。\n",
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"\n",
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"可以理解为，`for x in ...` 循环就是把每个元素代入变量x，然后执行缩进块的语句。\n",
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"\n",
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"如果是简单的按照次数的循环，一般用 range() 函数来产生一个可以生成迭代数字的序列"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": []
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"a1 = [x for x in a if a.count(x) <= 1]\n",
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"print(a1)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"“A mapping object maps hashable values to arbitrary objects. Mappings are mutable objects.” \n",
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"Understand Key-Value, like {'one': 1, 'two': 2, 'three': 3}\n",
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"Create DICT: d = {'Tom': 95, 'Jerry': 90, 'Tracy': 92}\n",
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"Add Key-Value: d['Hugo'] = 85\n",
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"Visit Key-Value: d.get('Tom')\n",
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"Delete Key-Value: d.pop('Tom')\n",
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"Length of DICT: len(d)\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"d = {'Tom': 95, 'Jerry': 90, 'Tracy': 92}\n",
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"print(d)\n",
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"print(d['Tom'])\n",
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"\n",
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"d['Hugo'] = 85\n",
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"print(d)\n",
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"\n",
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"d['Tom'] = 97\n",
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"print(d)\n",
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"\n",
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"'Tom' in d\n",
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"\n",
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"d.get('Tom')\n",
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"\n",
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"d.get('Tommy',80)\n",
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"\n",
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"d = {'Tom': 95, 'Jerry': 90, 'Tracy': 92}\n",
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"print(d)\n",
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"d.pop('Tom')\n",
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"print(d)\n",
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"\n",
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"d1 = {}\n",
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"for i in range(100):\n",
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" d1['id_'+str(i)] = i*3\n",
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"print(d1)\n",
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"\n",
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"print(len(d1))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"数据类型：Tuple 元组\n",
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"\n",
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"Tuple 也是一种有序列表，在存储数据方面和 List 很相似\n",
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"Tuple 一旦内容存储后，就不能修改；这样的好处是数据很安全\n",
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"初始化 Tuple : t = ('Tom', 'Jerry', 'Mary')\n",
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"应用范围：在我们需要使用 list 功能的时候，但是又不需要改变这个 list 的内容，用 Tuple 元组功能会很安全，不用担心程序中不小心修改了其内容\n",
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"\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"t = ('Tom', 'Jerry', 'Mary')\n",
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"print(t)\n",
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"\n",
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"t.append('Someone')\n",
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"\n",
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"t = ()\n",
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"print(t)\n",
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"\n",
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"l = ['A', 'B', 'C']\n",
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"t =(l, 100, 200)\n",
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"print(t)\n",
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"\n",
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"l.append('D')\n",
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"print(l)\n",
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"print(t)\n",
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"\n",
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"t = ('Tom', 'Jerry', 'Marry')\n",
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"print(t[1])"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"随机数\n",
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"\n",
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"随机数这一概念在不同领域有着不同的含义，在密码学、通信领域有着非常重要的用途\n",
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"Python 的随机数模块是 random\n",
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"随机挑选 random.choice()，random.sample()\n",
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"随机生成 random.random()， random.uniform()， random.randint()\n",
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"随机排列 random.shuffle()\n"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"import random\n",
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"\n",
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"print(random.choice(range(1,100)))\n",
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"\n",
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"print(random.sample(range(1,100), 10))\n",
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"\n",
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"print(random.randint(1,100))\n",
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"\n",
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"print(random.random())\n",
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"\n",
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"print(random.uniform(1,100))\n",
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"\n",
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"l1 = [12, 23, 1, 5, 87]\n",
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"random.shuffle(l1)\n",
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"print(l1)"
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]
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}
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],
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"metadata": {

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