What libraries should be installed for python crawler?

What libraries need to be installed to learn Python web crawler?

The following are the relevant libraries involved in Python crawlers

Request library, parsing library, storage library, tool library

1. Request library: urllib/re/requests

(1) urllib/re is the library that comes with Python by default. It can be verified by the following command:

No error message is output, indicating that the environment is normal

(2) requests installation

2.1 Open CMD and enter pip3 install requests

2.2 After waiting for the installation, verify

(3) selenium installation (driving the browser for website access behavior)

3.1 Open CMD and enter pip3 install selenium

3.2 Install chromedriver

Website: https://npm.taobao.org/

Unzip the downloaded compressed package and put the exe into D:\ Python3.6.0\Scripts\

This path only needs to be in the PATH variable

3.3 After the installation is completed, verify

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3.4 Install other browsers

Interfaceless browser phantomjs

Download URL: http://phantomjs.org/

After downloading, unzip it, put the entire directory into D:\Python3.6.0\Scripts\, and add the path to the bin directory to the PATH variable

Verification:

Open CMD

2. Parsing library:

2.1 lxml (XPATH)

Open CMD and enter pip3 install lxml or download it from https://pypi.python. org download, for example, lxml-4.1.1-cp36-cp36m-win_amd64.whl (md5), first download the whl file, and execute pip3 install on the command line. File name.whl

##2.2 beautifulsoup

Open CMD, you need to install lxml first

pip3 install beautifulsoup4

##2.3 pyquery (similar to jquery syntax)

Open CMD, pip3 install pyquery

Verify the installation results

3. Repository

3.1 pymysql (operating MySQL, relational database )

Installation: pip3 install pymysql, test after installation:

##3.2 pymongo (operate MongoDB, key-value)

Install pip3 install pymongo

Verification

3.3 redis (distributed crawler, maintain crawling queue) Installation: pip3 install redis

Verification:

4.1Django (distributed crawler maintenance system) pip3 install django

4.2jupyter (notepad running on the web page , supports markdown, and can run code on the web page) Install pip3 install jupyter

Verification: Open CMD, jupyter notebook

and then you can create notepads, code blocks and Markdown block, supports printing

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