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‎.gitignore‎

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/*/mnist/*
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static files/*
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/*/novels/*
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/*/*.model

‎01. python tools/01.01 python overview.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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"collapsed": true
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},
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"source": [
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"# Python 简介"
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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** 历史"
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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` 的创始人为荷兰人吉多·范罗苏姆（`Guido van Rossum`）。1989年的圣诞节期间，吉多·范罗苏姆为了在阿姆斯特丹打发时间，决心开发一个新的脚本解释程序，作为 ABC 语言的一种继承。之所以选中 `Python` 作为程序的名字，是因为他是 BBC 电视剧——蒙提·派森的飞行马戏团（`Monty Python's Flying Circus`）的爱好者。\n",
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"\n",
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"1991年，第一个 Python 编译器诞生。它是用C语言实现的，并能够调用C语言的库文件。\n",
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"\n",
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"`Python 2.0` 于 2000 年 10 月 16 日发布，增加了实现完整的垃圾回收，并且支持 `Unicode`。\n",
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"\n",
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"`Python 3.0` 于 2008 年 12 月 3 日发布，此版不完全兼容之前的 `Python` 源代码。不过，很多新特性后来也被移植到旧的 `Python 2.6/2.7` 版本。"
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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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"## 第一行Python代码"
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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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"安装好 `Python` 之后，在命令行下输入：\n",
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"\n",
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" python\n",
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"\n",
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"就可以进入 `Python` 解释器的页面。\n",
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"\n",
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"按照惯例，第一行代码应该是输出 `\"hello world!\"`："
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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": 1,
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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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"hello world!\n"
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]
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}
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],
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"source": [
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"print \"hello world!\""
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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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"相对与 `Java，C` 等语言，`Python` 仅仅使用一行语句就完成的了这个任务。\n",
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"\n",
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"可以将这句话的内容保存到一个文本文件中，并使用后缀名 `.py` 结尾，例如 `hello_world.py`，在命令行下运行这个程序：\n",
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"\n",
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" python hello_world.py\n",
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"\n",
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"也会输出 `\"hello world!\"` 的结果。"
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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 之禅"
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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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"在 **Python** 解释器下输入 \n",
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"\n",
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"```import this```\n",
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"\n",
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"会出来这样一首小诗："
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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": 2,
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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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"The Zen of Python, by Tim Peters\n",
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"\n",
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"Beautiful is better than ugly.\n",
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"Explicit is better than implicit.\n",
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"Simple is better than complex.\n",
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"Complex is better than complicated.\n",
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"Flat is better than nested.\n",
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"Sparse is better than dense.\n",
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"Readability counts.\n",
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"Special cases aren't special enough to break the rules.\n",
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"Although practicality beats purity.\n",
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"Errors should never pass silently.\n",
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"Unless explicitly silenced.\n",
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"In the face of ambiguity, refuse the temptation to guess.\n",
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"There should be one-- and preferably only one --obvious way to do it.\n",
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"Although that way may not be obvious at first unless you're Dutch.\n",
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"Now is better than never.\n",
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"Although never is often better than *right* now.\n",
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"If the implementation is hard to explain, it's a bad idea.\n",
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"If the implementation is easy to explain, it may be a good idea.\n",
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"Namespaces are one honking great idea -- let's do more of those!\n"
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]
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}
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],
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"source": [
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"import this"
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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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"这首诗反映了**Python**的设计哲学——**Python**是一种追求优雅，明确，简单的编程语言，但事实上，产生这首诗的代码并没有写的那么简单易懂："
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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": 3,
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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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"The Zen of Python, by Tim Peters\n",
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"\n",
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"Beautiful is better than ugly.\n",
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"Explicit is better than implicit.\n",
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"Simple is better than complex.\n",
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"Complex is better than complicated.\n",
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"Flat is better than nested.\n",
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"Sparse is better than dense.\n",
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"Readability counts.\n",
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"Special cases aren't special enough to break the rules.\n",
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"Although practicality beats purity.\n",
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"Errors should never pass silently.\n",
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"Unless explicitly silenced.\n",
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"In the face of ambiguity, refuse the temptation to guess.\n",
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"There should be one-- and preferably only one --obvious way to do it.\n",
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"Although that way may not be obvious at first unless you're Dutch.\n",
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"Now is better than never.\n",
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"Although never is often better than *right* now.\n",
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"If the implementation is hard to explain, it's a bad idea.\n",
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"If the implementation is easy to explain, it may be a good idea.\n",
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"Namespaces are one honking great idea -- let's do more of those!\n"
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]
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}
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],
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"source": [
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"s = \"\"\"Gur Mra bs Clguba, ol Gvz Crgref\n",
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"\n",
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"Ornhgvshy vf orggre guna htyl.\n",
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"Rkcyvpvg vf orggre guna vzcyvpvg.\n",
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"Fvzcyr vf orggre guna pbzcyrk.\n",
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"Pbzcyrk vf orggre guna pbzcyvpngrq.\n",
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"Syng vf orggre guna arfgrq.\n",
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"Fcnefr vf orggre guna qrafr.\n",
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"Ernqnovyvgl pbhagf.\n",
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"Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.\n",
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"Nygubhtu cenpgvpnyvgl orngf chevgl.\n",
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"Reebef fubhyq arire cnff fvyragyl.\n",
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"Hayrff rkcyvpvgyl fvyraprq.\n",
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"Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.\n",
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"Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.\n",
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"Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.\n",
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"Abj vf orggre guna arire.\n",
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"Nygubhtu arire vf bsgra orggre guna *evtug* abj.\n",
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"Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.\n",
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"Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.\n",
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"Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!\"\"\"\n",
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"\n",
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"d = {}\n",
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"for c in (65, 97):\n",
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" for i in range(26):\n",
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" d[chr(i+c)] = chr((i+13) % 26 + c)\n",
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"\n",
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"print \"\".join([d.get(c, c) for c in s])"
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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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"> Life is short. Use Python."
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 2",
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"language": "python",
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"name": "python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 2
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython2",
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"version": "2.7.6"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 0
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}

‎01. python tools/01.01 python overview.ipynb.REMOVED.git-id‎

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