Getting started with win environment python3 flash

acclea 2021-01-20 16:19:27
getting started win environment python3


In order to learn , Step by step according to official documents

1、 Virtual Environment Download

    This is done in accordance with the documentation and generally will not cause problems , If you download it Tips 【 Overtime 】, Please set the image source to any one in China , It can last forever , It can also be temporary , I don't know how to set it. I can search it online

    Domestic sources are as follows :

tsinghua :https://pypi.tuna.tsinghua.edu.cn/simple

Alibaba cloud :http://mirrors.aliyun.com/pypi/simple/

University of science and technology of China https://pypi.mirrors.ustc.edu.cn/simple/

Huazhong University of technology :http://pypi.hustunique.com/

Shandong University of technology :http://pypi.sdutlinux.org/ 

douban :http://pypi.douban.com/simple/

note: new edition ubuntu Required https Source , it is to be noted that .

for example :

A version     pip3 install -i https://pypi.doubanio.com/simple/ Package name

Many versions ( Such as python39)    python39 -m pip3 install -i https://pypi.doubanio.com/simple/ Package name

Temporary use :( The reason why it was written , Yes, I don't want to search again ……)

Can be used in pip When adding parameters -i https://pypi.tuna.tsinghua.edu.cn/simple
for example :pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pyspider, In this way, you can install the image from Tsinghua pyspider library .

Permanent modification , Once and for all :

Linux Next , modify ~/.pip/pip.conf ( No create a folder and file . Folder to add “.”, Means to hide the folder )

The contents are as follows :

[global]
index-url = https://pypi.tuna.tsinghua.edu.cn/simple
[install]
trusted-host=mirrors.aliyun.com

windows Next , Directly in user Create a pip Catalog , Create a new file pip.ini.( for example :C:\Users\WQP\pip\pip.ini) Same as above .

quote :http://www.cnblogs.com/microman/p/6107879.html

 

2、 Virtual environment installation

Just follow the document , After environment activation , Remember to go back to the root of the project , Otherwise The following prompt appears

flask.cli.NoAppException: Could not import "hello".

Waste a lot of time …………

 

When you get here, you can see cmd

Browser access :http://127.0.0.1:5000/

A start without a rollover

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