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2017.2.27 small adds on lesson 2
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‎python_basic/python_basic_lesson_02.ipynb‎

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@@ -6,7 +6,8 @@
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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",
9+
"Python Basic, Lesson 2, v1.0.0, 2016.12 by David.Yi \n",
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"Python Basic, Lesson 2, v1.0.1, 2017.02 modified by Yimeng.Zhang \n",
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"\n",
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"\n",
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"### 上次内容要点\n",
@@ -30,7 +31,7 @@
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"* 随机数介绍\n",
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"* 举例\n",
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" * 中文分词介绍\n",
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" * 小程序联系"
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" * 小程序练习（猜拳游戏）"
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]
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},
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{
@@ -241,7 +242,7 @@
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"\n",
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"#### 列表\n",
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"\n",
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"列表 list 是 python 内置的一种数据类型。list是一种有序的集合，可以随时添加和删除其中的元素。\n",
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"列表 list 是 python 内置的一种数据类型。list是一种可变、有序的集合，可以随时添加和删除其中的元素。\n",
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"列表在一般的 python 程序中是最常用的数据类型。\n",
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"\n",
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"列表的基本概念：\n",
@@ -287,7 +288,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 17,
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"execution_count": 18,
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"metadata": {
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"collapsed": false
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},
@@ -296,17 +297,24 @@
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"['bird']\n"
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"['bird']\n",
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"['bird', 'snake']\n",
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"['sheep', 'bird', 'snake']\n"
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]
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}
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],
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"source": [
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"# 列表初始化\n",
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"a = []\n",
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"\n",
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"# 列表追加元素\n",
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"# 列表末尾追加元素\n",
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"a.append('bird')\n",
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"print(a)\n",
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"a.append('snake')\n",
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"print(a)\n",
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"\n",
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"# 列表指定位置插入元素\n",
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"a.insert(0,'sheep')\n",
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"print(a)"
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]
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},
@@ -321,13 +329,12 @@
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"['bird']\n"
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"['sheep', 'snake']\n"
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]
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}
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],
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"source": [
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"# 列表删除指定序号的元素\n",
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"\n",
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"a.pop(1)\n",
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"print(a)"
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]
@@ -426,6 +433,28 @@
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"print(a)"
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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": 24,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"2\n"
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]
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}
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],
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"source": [
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"# 统计某个元素在列表中出现次数\n",
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"\n",
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"a = ['a','b','b','c']\n",
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"print(a.count('b'))"
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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": 24,
@@ -559,6 +588,13 @@
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"\n",
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"字典中的 key 值不可以重复（定义后也没有办法重复）\n",
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"\n",
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"字典的几个特点：\n",
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"1. 查找和插入的速度极快，不会随着key的增加而变慢； \n",
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"2. 需要占用大量的内存，内存浪费多。 \n",
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"而list相反：\n",
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"1. 查找和插入的时间随着元素的增加而增加； \n",
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"2. 占用空间小，浪费内存很少。 \n",
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"\n",
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"* 创建字典\n",
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"* 访问字典中的 key-value\n",
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"* 修改字典中的 key-value\n",
@@ -717,7 +753,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"execution_count": 3,
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"metadata": {
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"collapsed": false
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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": 11,
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"execution_count": 4,
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"metadata": {
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"collapsed": false
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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": 7,
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"execution_count": 8,
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"metadata": {
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"collapsed": false
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},
@@ -770,10 +806,10 @@
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"evalue": "'tuple' object has no attribute 'append'",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mAttributeError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m<ipython-input-7-98c1182e5bbc>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[1;32m 1\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 2\u001b[0;31m \u001b[0mt\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mappend\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m'Someone'\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;31mAttributeError\u001b[0m: 'tuple' object has no attribute 'append'"
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[1;31mAttributeError\u001b[0m Traceback (most recent call last)",
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"\u001b[1;32m<ipython-input-8-e2bbceae4065>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[0;32m 1\u001b[0m \u001b[1;31m# 元组创建后是不能修改的\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m 2\u001b[0m \u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mt\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mappend\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m'Someone'\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[1;31mAttributeError\u001b[0m: 'tuple' object has no attribute 'append'"
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]
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}
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],
@@ -785,7 +821,30 @@
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},
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{
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"cell_type": "code",
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"execution_count": 8,
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"execution_count": 9,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"ename": "TypeError",
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"evalue": "'tuple' object does not support item assignment",
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"output_type": "error",
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"traceback": [
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"\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[1;31mTypeError\u001b[0m Traceback (most recent call last)",
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"\u001b[1;32m<ipython-input-9-a9cd518cf863>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m()\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mt\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m]\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;34m'aaa'\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[1;31mTypeError\u001b[0m: 'tuple' object does not support item assignment"
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]
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}
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],
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"source": [
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"t[1] = 'aaa'"
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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": 22,
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"metadata": {
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"collapsed": false
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},
@@ -808,7 +867,7 @@
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"execution_count": 23,
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"metadata": {
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"collapsed": false
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},
@@ -817,17 +876,45 @@
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"(['A', 'B', 'C'], 100, 200)\n",
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"['A', 'B', 'C', 'D']\n",
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"(['A', 'B', 'C', 'D'], 100, 200)\n"
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]
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}
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],
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"source": [
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"# 变通的实现可变元组内容\n",
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"\n",
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"# 变通的实现\"可变\"元组内容\n",
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"print(t)\n",
828888
"l.append('D')\n",
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"print(l)\n",
830-
"print(t)"
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"print(t) # tuple的每个元素，指向永远不变，但指向的元素本身是可变的"
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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": 20,
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"metadata": {
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"collapsed": false
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"<class 'int'>\n",
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"<class 'tuple'>\n"
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]
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}
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],
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"source": [
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"# 创建只有1个元素的元组\n",
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"\n",
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"l = (1)\n",
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"print(type(l)) # l成了一个整数，因为这里的括号有歧义，被认作数学计算里的小括号\n",
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"\n",
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"# 1个元素的元组必须加逗号来消除歧义\n",
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"l = (1,)\n",
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"print(type(l))"
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]
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},
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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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"execution_count": 14,
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"metadata": {
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"collapsed": true
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"collapsed": false
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},
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"outputs": [],
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"0:剪刀 1:石头 2:布\n",
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"你出了:2\n",
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"电脑出了 剪刀\n",
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"computer win\n"
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]
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}
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],
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"source": [
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"# 简单的剪刀石头布\n",
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"\n",
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"SECOND = 1 \n",
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"BOTH = 2 \n",
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"\n",
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"t1 = ('scissors', 'stone', 'cloth')\n",
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"t1 = ('剪刀', '石头', '布')\n",
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"t2 = ('human win', 'computer win', 'draw')\n",
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"\n",
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"def which_win(i1, i2):\n",
@@ -1218,17 +1316,18 @@
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" if i1 == i2:\n",
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" return BOTH\n",
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"\n",
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"print('0:scissors 1:stone 2:cloth')\n",
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"human = int(input('please input:'))\n",
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"print('0:剪刀 1:石头 2:布')\n",
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"human = int(input('你出了:'))\n",
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"\n",
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"c_index = random.randint(0,2)\n",
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"computer = t1[c_index]\n",
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"\n",
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"print(c_index, computer)\n",
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"print(\"电脑出了\",computer)\n",
12281326
"\n",
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"print(t2[which_win(human, c_index)])\n",
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"\n",
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"# 如何优化改进？"
1329+
"# 如何优化改进？\n",
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"# 如何设计记录5局3胜的功能？"
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]
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}
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],
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.5.2"
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"version": "3.5.1"
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}
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},
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"nbformat": 4,

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