微软官方出的python教程_学习笔记

心已赠人 2023-02-17 03:21 116阅读 0赞

# 写在前面的话： #

今天看到了这个微软出的python教程，所以用它来重温一下python的知识体系。下面这句话与君共勉：

**The best time to get in and start exploring is now.**

# What is python? #

Flexible programming language

Designed to be human readable

# Why use it? #

Great starter language

Great advanced language

Wonderful community

# Print ("") #

Print('')

单双均可，不要混用，其实我一直是 字符串双， 单个字符单 这样子

Name = input('Please enter your name:')

Print(name)

换行  \\n

Debugging with print

# Comments document #

\#时间允许的话可以都加上注释，然后逐渐恢

快捷键   加注释 ctrl k c    （在vscode里， pycharm里我找一下  ctrl /

代码编辑快捷键

序号         快捷键         作用

1         CTRL + ALT + SPACE         快速导入任意类

2         CTRL + SHIFT + ENTER         代码补全

3         SHIFT + F1         查看外部文档

4         CTRL + Q         快速查找文档

5         CTRL + P         参数信息（在方法中调用的参数）

6         CTRL + MOUSE OVER CODE         基本信息

7         CTRL + F1         显示错误或警告的描述

8         CTRL + INSERT         生成代码

9         CTRL + O         重载方法

10         CTRL + ALT + T         包裹代码

11         CTRL + /         单行注释

12         CTRL + SHIFT + /         块注释

13         CTRL + W         逐步选择代码（块）

14         CTRL + SHIFT + W         逐步取消选择代码（块）

15         CTRL + SHIFT + \[         从当前位置选择到代码块的开始

16         CTRL + SHIFT + \]         从当前位置选择到代码块的结束

17         ALT + ENTER         代码快速修正

18         CTRL + ALT + L         代码格式标准化

19         CTRL + ALT + O         最佳化导入

20         CTRL + ALT + I         自动缩进

21         TAB         代码向后缩进

23         SHIFT + TAB         代码向前取消缩进

24         CTRL + SHIFT + V         历史复制粘贴表

25         CTRL + D         复制当前代码行/块

26         CTRL + Y         删除当前代码行/块

27         CTRL + SHIFT + J         代码连接为一行

28         SHIFT + ENTER         开启新一行

28         CTRL + SHIFT + U         字母大写

29         CTRL +DELETE         向后逐渐删除

30         CTRL + BACKSPACE         向前逐渐删除

31         CTRL + NUMPAD+/-         代码块展开/折叠

32         CTRL + SHIFT + NUMPAD+         所有代码块展开叠

33         CTRL + SHIFT + NUMPAD-         所有代码块折叠

34         CTRL + F4         关闭活动编辑窗口

————————————————

# 使用字符串 #

Strings

不需要声明， 直接用，

连接字符串  + 就可以

‘hello’+‘world’

Upper

Lower

Captitalize

（大写）

高级

\{\} 占位符

大括号可以当占位符

字符串前加f来格式字符串，更具有可读性

# 数值类型转换 #

str（）

int（）

float（）

# 日期 #

常用的是i也纳入一个 datetime 库

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70][]

from datetime import datetime

current\_date = datetime.now()

\# the now function returns a datetime object

print('Today is:'\+str(current\_date))

\#timedelta is used to define a period of time

one\_day = timedelta(days=1)

yesterday = today - one\_day

print('Yesterday was: '\+ str(yesterday))

\#timedelta is used to define a period of time

one\_day = timedelta(days=1)

yesterday = today - one\_day

print('Yesterday was: '\+ str(yesterday))

from datetime import datetimebirthday = input('When is your birthday (dd/mm/yyyy)?')

birthday\_date = datetime.strptime(birthday, '%d/%m/%Y')

print('Brithday:'\+str(birthday\_date))

Striptime 看它的说明

# 错误类型 #

Try

Except

Finally

try:

pass\# pass 就是可以在这里继续写

except expression as identifier:

pass

else:

pass

finally:

pass

# 条件语句 #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 1][]

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![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 3][]

我们要测试every possible condition

（   ，   ，   ，）

in也可以， 多个条件in

有时可以用and 来代替if条件

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 4][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 5][]

Really do the unit testing well

# 列表 数组 字典 #

Json

Lllist    dictionaries

（多选  ctrl D 一次性更改多个）

# 循环  #

Loops

只有两种

For

While

For  xxx in \['dfsfd','fdsf'\]:

Print()

需要指定循环的次数， 使用range（0，5）

将会有0，1，2，3，4 这样循环

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 6][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 7][]

# 使用函数 #

老实讲，程序员都很懒， copy paste 是我们的好朋友

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 8][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 9][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 10][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 11][]

定义函数 在调用之前

记得给你的函数写注释，这样你回来再看的时候就知道是什么

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 12][]

传 默认值

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 13][]

另一种，命名法（不用管顺序辽）

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 14][]

# 模块和 包 #

Utilizing models

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 15][]

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Install packages

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 19][]

# 虚拟环境 virtual environments #

By default， oackages are installed globally

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 20][]

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# 调用API #

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 23][]

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Get 和 post 区别

get只能传长字符串，遇到转义字符或者特殊字符比较麻烦

post可以传各种信息，比较强大一点

Requests 库

不用慌，直接求看文档，怎么用都写着

# Json的三种结构 #

返回json的时候，可以丢到网页里去让它自动排版，这样就能看到返回的是什么了，再粘回来酱紫

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 25][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 26][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 27][]

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创建json

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 29][]

Json linter

美化， 多print看得到的是什么，对应关系是什么

# 环境变量 #

不论何时处理敏感的数据类型，都要小心处理

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 30][]

导入os 库， 在os库中调用名为 getenv的函数

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 31][]

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# 装饰器 #

真正重要的是当它作为框架的一部分

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 37][]

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# 总结 #

其实是推荐

**用进废退和熟能生巧**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3podWppYWxpYW5nMTg_size_16_color_FFFFFF_t_70 39][]

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**The best time to** **get in and start exploring is now.**

**That knowledge is just like any other muscle, if you don't use it it will atrophy.**

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