Python学习day02 - 编程分类和Pycharm和Jupyter的安装

编程语言分类

• 编程语言是用来和计算机交互的，计算机只认识0和1

机器语言（低级语言）

直接和硬件交互

用0和1和计算机沟通

优点：执行效率最高

缺点：开发效率低

汇编语言直接和硬件交互

优点（相较于机器语言）：开发效率略高

缺点（相较于机器语言）：执行效率略低

---

高级语言

接近于人类语言

编译型（一次性丢入谷歌翻译）

C/JAVA/GO

和计算机硬件间接交互

记录下来，全部说完然后翻译，文件编译成另一个obj文件，再和计算机沟通得到结果

优点（相较于解释型语言）：执行效率高

缺点（相较于解释型语言）：开发效率低

 

 

 

xxxxxxxxxx

 

 

#include <stdio.h>

​

int main ()

{

    printf ("hello world!\n")

 

 

}

 

 

把代码翻译成机器语言，通过编译器（汇编语言/机器语言写的）

解释型（同声翻译）

python无所不能

说一句翻译一句，python即是如此

优点（相较于编译型语言）：开发效率高

缺点（相较于编译型语言）：执行效率低

 

 

 

xxxxxxxxxx

 

 

 

 

print('hello world')

 

 

翻译成机器语言，一般是通过解释器（编译型语言写的）

我们写程序，程序运行越快越好，应该用编译

网络瓶颈效应

应用程序大多都需要联网

网络延迟10ms，编译型程序比解释型程序大概快1ms左右

硬件性能，

编程语言优缺点（个人观点，勿喷）

• C：和硬件交互（工厂造物）
• C++：面向对象的C（上帝造人）
• JAVA：跨平台非常好
• PHP：世界上最好的语言，只能做后端
• Python：无所不能（Python比喻成一部手机，一个库一个应用程序）
• GO：高并发（同一时刻多人一起使用），支持高并发，编译型。
• js：史上语法最烂的语言（兼顾太多反而顾头不顾尾）
• app：最早是网页源码打包生成的apk

推荐书籍《美丽新世界》

Pycharm的常用指令

• ctrl + a
• ctrl + c 默认复制当前行
• ctrl + v
• ctrl + x
• ctrl + d 复制粘贴，默认当前行
• ctrl + y 删除默认当前行
• ctrl + z 撤销
• ctrl + f 搜索
• home(ctrl +[) 回到首个字符
• end 回到最后一个字符
• alt + shift + F10 选择运行文件
• shift + F10 运行当前文件
• shift + enter 换行
• ctrl + shift + r 项目全局搜索
• ctrl + alt + l 代码整理
• local history -->show history 查看历史记录
• compare with --> 文件比较

pycharm的快捷键修改的位置：

file -> settings -> Keymap

右侧可以搜索各种快捷键的功能，然后修改成任意自己熟悉的快捷键

安装Jupyter

1. 修改镜像源

External libraries -->Python 3.6 --> site-packages-->pip-->models-->index.py

最后一行，修改PyPI = Index('https://pypi.douban.com/')

修改之后更新软件速度会比国外的镜像源要快很多。

2. 安装pip

pip install jupyter

然后升级pip3 install --upgrade pip

如果出现Fatal error错误

python -m pip install jupyter

file -- > settings --> project --> project interpreter --> + 号 -->搜索jupyter --> install

进入jupyter的命令

在cmd窗口输入：

jupyter notebook

3. Jupyter插件的安装

• pip install jupyter_contrib_nbextensions
• jupyter contrib nbextension install --user

4. juopyter快捷键

enter 进入代码块

shift + enter 运行

m 进入markdown模式

y 进入python模式

esc 退出

shift + 鼠标左键 选中多个

f 搜索+替换

d,d 删除

file --> download as --> md

查看快捷键:help --> keyboards

小tips：

• jupyter打开py结尾的文件的方法,即py文件转化为ipynb文件

  %run **.py

  %load **.py

• unindent does not match any outer indentation level类似报错

  比较常见的原因就是修改一些代码的时候出现了空格，尤其是行首的位置，要注意

• 
• 如上图，如果此处有空格，就会报各种错误，很多时候就是这些非常低级的问题，报各种莫名其妙的错误，所以修改一些配置文件的时候一定要注意。

第二天过去，虽然环境不是特别好，学到的东西还是不错的，感觉自己喜欢这种发现bug的生活，能改错，才是成功。

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table tr th { font-weight: bold; border-width: 1px 1px 0px; border-top-style: solid; border-right-style: solid; border-left-style: solid; border-top-color: rgb(223, 226, 229); border-right-color: rgb(223, 226, 229); border-left-color: rgb(223, 226, 229); border-image: initial; border-bottom-style: initial; border-bottom-color: initial; text-align: left; margin: 0px; padding: 6px 13px; }
table tr td { border: 1px solid rgb(223, 226, 229); text-align: left; margin: 0px; padding: 6px 13px; }
table tr th:first-child, table tr td:first-child { margin-top: 0px; }
table tr th:last-child, table tr td:last-child { margin-bottom: 0px; }
.CodeMirror-lines { padding-left: 4px; }
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.md-fences, code, tt { border: 1px solid rgb(231, 234, 237); background-color: rgb(248, 248, 248); border-radius: 3px; padding: 2px 4px 0px; font-size: 0.9em; }
code { background-color: rgb(243, 244, 244); padding: 0px 2px; }
.md-fences { margin-bottom: 15px; margin-top: 15px; padding-top: 8px; padding-bottom: 6px; }
.md-task-list-item > input { margin-left: -1.3em; }
@media print {
html { font-size: 13px; }
table, pre { break-inside: avoid; }
pre { overflow-wrap: break-word; }
}
.md-fences { background-color: rgb(248, 248, 248); }
#write pre.md-meta-block { padding: 1rem; font-size: 85%; line-height: 1.45; background-color: rgb(247, 247, 247); border: 0px; border-radius: 3px; color: rgb(119, 119, 119); margin-top: 0px !important; }
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.md-mathjax-midline { background: rgb(250, 250, 250); }
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#write > h4.md-focus::before { left: -1.5625rem; top: 0.285714rem; }
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#write > h6.md-focus::before { left: -1.5625rem; top: 0.285714rem; }
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.md-tag { color: rgb(167, 167, 167); opacity: 1; }
.md-toc { margin-top: 20px; padding-bottom: 20px; }
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#typora-quick-open { border: 1px solid rgb(221, 221, 221); background-color: rgb(248, 248, 248); }
#typora-quick-open-item { background-color: rgb(250, 250, 250); border-color: rgb(254, 254, 254) rgb(229, 229, 229) rgb(229, 229, 229) rgb(238, 238, 238); border-style: solid; border-width: 1px; }
.on-focus-mode blockquote { border-left-color: rgba(85, 85, 85, 0.12); }
header, .context-menu, .megamenu-content, footer { font-family: "Segoe UI", Arial, sans-serif; }
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.md-lang { color: rgb(180, 101, 77); }
.html-for-mac .context-menu { --item-hover-bg-color: #E6F0FE; }
#md-notification .btn { border: 0px; }
.dropdown-menu .divider { border-color: rgb(229, 229, 229); }
-->