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This article mainly explains "how to automatically install third-party libraries in Python3". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's ideas to study and learn "how to automatically install third-party libraries in Python3".

Catalogue

1. Introduction

2. Manual installation of pip

2.1 online installation

2.1.1 default installation

2.1.2 specified version installation

2.2 offline installation

2.3 set domestic sources

2.4 Uninstall and upgrade

2.4.1 Uninstall

2.4.2 upgrade

3. Automatic installation of pip.main

3.1 pip main installation

3.2 os installation

1. Introduction

Python automatically installs third-party libraries, completely liberating your hands!

2. Manual installation of pip

When it comes to installing third-party libraries in Python, our first reaction is that it must be installed in pip mode, no problem, necessary.

But think about it, if you change computers (Tuhao has changed computers, I have changed friends), and there are so many third-party libraries in Python, do you have to hit pip install?? again and again?

However, according to the process, we will first introduce the manual installation of pip, and then introduce today's corner: automatic installation of third-party libraries

2.1 online installation 2.1.1 default installation

It's a clich é, a direct order:

Pip install third-party library name 2.1.2 specify version installation

Specify the version installation command for the third-party library:

Pip install third-party library name = = version number

For example

Pip install selenium==3.3

Several ways to specify the version number:

If ① is not specified, the latest

② = = specify a specific version number

③ = specify the minimum version number

five

No less than a certain version number

Be careful

Here's a hint. If you don't specify a specific version number, you need to use quotation marks (''), as follows:

Pip install selenium==3.32.2 offline installation

Many python libraries will time out online installation, or there is no network, at this time, you will think of offline installation.

After all, it's not right to fish at work.

It is also wrong to use the company network to download the installation package.

Here are two very comprehensive third-party library addresses. You are welcome, just take them away:

Health website: https://www.lfd.uci.edu/~gohlke/pythonlibs/

Pypi: https://pypi.org/

Little loser: brother Fish, offline installation, how many steps are there in total?

Xiaoyu: there are three steps in total. Please count with me:

Step 1: log in to the Python third-party library website

Step 2: download the files of the third library to the local

Step 3: install locally

Command

Pip install C:\ Project\ pyRXP-2.2.0-cp35-cp35m-win_amd64.whl2.3 set domestic source

Little loser: brother Fish, is there a way to install quickly without having to download it to the local place?

Fish: it's a must. Get in the car and follow the orders.

If you do not want to download to the local, but also want to directly install pip, then consider the domestic source image.

Command

Pip install plotly-I https://pypi.tuna.tsinghua.edu.cn/simple

The domestic source address is as follows:

Ali Cloud Image: http://mirrors.aliyun.com/pypi/simple/

Image of Tsinghua University: https://pypi.tuna.tsinghua.edu.cn/simple/

Douban image: http://pypi.doubanio.com/simple/

Mirror image of China University of Science and Technology: https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple/

Little loser: brother Fish, this is a good method, but I don't want to enter the address every time. Can I find a way to do it once and for all

Fish: … You are very demanding, but there can be some ways.

Just under your current project, create a pip.ini file and call the contents of the file directly to OK:

2.4 Uninstall and upgrade 2.4.1 Uninstall

If there is installation, there will be uninstallation.

It's also very simple, a command.

Pip uninstall third-party library name 2.4.2 upgrade

Before upgrading, we need to check it as follows:

1. View commands

① to view installed libraries

Pip list

② views the specified library

Pip show Library name

2. Upgrade command

① to view upgradeable libraries

Pip list-o

② upgrade command

Pip install-- upgrade library name 3, pip.main automatic installation 3.1 pip main installation

She came out shyly after thousands of calls, holding the pipa without covering her face!

The front has done so much groundwork, the protagonist appears, can applaud, do not stop the kind!

We've all been through it, and then other people's code (refusing to be the scapegoat) moved on, but there are some libraries that we didn't install.

At this time, it is very painful, keep reminding that there is no library, keep installing

It's hard to think about it.

Little loser: so is there a way to do it in one step?

Fish: yes, get in the car and put the code.

Code presentation

#-*-coding:utf-8-*-# @ Time: 2021-08-0permission @ Author: carl_DJ "" if the referenced library is not installed, it is automatically installed "" # in order to clarify the exception information We append the assertion try: import requests import pandas as pd from bs4 import BeautifulSoup import jieba import jieba.analyse import matplotlib.pyplot as plt from wordcloud import WordCloud,STOPWORDS import numpy as np from PIL import Image# installs dependent libraries using the pip.main () method (examples of several commonly used libraries) except ImportError: import pip pip.main (["install", "--user", "requests", "beautifulsoup4", "matplotlib", "wordcloud", "pandas") "pillow"]) import requests import pandas as pd from bs4 import BeautifulSoup import jieba import jieba.analyse import matplotlib.pyplot as plt from wordcloud import WordCloud,STOPWORDS import numpy as np from PIL import Image

To execute this code, all that is left is to liao (mei).

Because the small fish have been installed, so it will not be carried out.

3.2 os installation

Little loser: seeing this, I think I'm awesome.

Xiaoyu: where is it? I use a single line of code to install it automatically.

Little loser: I don't know.

Code presentation

#-*-coding:utf-8-*-# @ Time: 2021-08-0 libraries @ Author: libraries to be installed by carl_DJimport os# libs = ["requests", "beautifulsoup4", "matplotlib", "wordcloud", "pandas", "pillow"] # cycle through installation for lib in libs: os.system ("pip install" + lib) Thank you for reading, this is the content of "how to automatically install third-party libraries in Python3" After the study of this article, I believe you have a deeper understanding of how to automatically install third-party libraries in Python3, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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