Web page automation practice "1. use the PY third-party library selenium to complete the access operation of elong"

Catalog

• One 、 preparation
  • 1. Create the corresponding project
  • 2. What do you use python Environmental Science
• Two 、 Brief introduction selenium
  • 1.selenium What does the kit contain
  • 2. How to install
  • 3. Import and stock in
  • 4. Download the Google driver in the same version as the Google browser , And put the drive in py Under the installation path of , Google Chrome must be installed on c disc
• 3、 ... and 、 Code

One 、 preparation

1. Create the corresponding project

install python3.5 Above version , Do not install the latest version , Latest version python There may be a bug, The old version is more stable .

stay pycharm Click on the file---new project：

1） A virtual environment ：

2） Local installed environment ：

Maybe your computer has 37、38 Version of python.

Local system environment -- Select installation path ：

Click on creat, Pop up the pop-up box , choice this window, Successfully created project .

The above two ways , Choose one to use , You can create corresponding projects .

2. What do you use python Environmental Science

expanded memory bank （External Libraries） The following shows python Environmental Science ：

This is the environment I chose , Next, all the code runs in this environment , The third-party libraries to be installed in the future are all in this environment .

Two 、 Brief introduction selenium

selenium Is a web automation toolkit , The most popular open source web page operation tool .

1.selenium The kit contains ：

Recording work -ide. Write code --webdriver. distributed processing --grid.

python--webdriver

1） Do you have the ability to solve problems . 2） Your local python Whether you have the ability to operate web pages . install python after , There is no default . To install a python Third party library （ Install external library , Let your local python Have corresponding ability ）.

2. How to install ？

pip command . Online installation .pip install 1） Download the latest version . Version update . 2） If your third-party library has dependent Libraries , Then it will be installed for you automatically . python3 How many versions do you want ,pip The installed dependent libraries generally do not have any conflicts . 3） Where is it installed ？ Which environment is the project , The required external libraries are installed in the environment .

3. Import and stock in ：

from selenium import webdriver

ctrl+b Jump to view the source code of the library .

4. Download the Google driver in the same version as the Google browser , And put the drive in py Under the installation path of , Google Chrome must be installed on c disc

Download Google browser ：https://www.chromedownloads.net/chrome64win/

Download the Google driver that matches the Google browser ：https://chromedriver.chromium.org/downloads

32 Bit drive , Support at the same time 32 and 64 Bit windows10 System .

Select a non default path for browser installation , This is what many people often do in order not to occupy the system disk space . But for Selenium The environment is a little confused .

go back to Selenium Principle , When running code , Will pass ChromeDriver The plug-in starts a Socket Service and generate a Sessionid Open browser window , The browser window is opened to execute the application file of the browser （ Such as Chrome Of chrome.exe）.

If the browser is installed in a non default path , Now Selenium Cannot find this binary chrome.exe The file throws an exception at this time ：

WebDriverException:Message:unknown error:cannot find Chrome binary

The easiest way ： Uninstall browser , Reinstall to the default path .

1. Google Chrome is on c Under my new folder

chromedriver.exe Put it in python Under the installation path of .

2. Google drives me on python Under the installation path of

Because... Has been configured python The installation path of is the system variable --path Environment variables under , So there is no need to configure Google driven environment variables .

3. Because the browser is not installed with , It is a compressed package . Remember to configure the decompressed path of the Google browser zip to the environment variable - System variables -path In the middle , Otherwise, the running code will report an error and cannot find the Google driver .

Reference link ：https://blog.csdn.net/ouyanggengcheng/article/details/90476553

（ Group Friends reply ： All afternoon , Finally solve , The best way is to reinstall chrome, Let him be in the default position , I used the following add browser location , But it doesn't work ）

If the correct configuration is still not available , Be sure to restart the computer .

3、 ... and 、 Code

'''
1、 .py suffix .
2、python Language .
 chinese -- Grammatical expression .  Rule of grammar .
      having dinner 
      train 
      high-speed rail 
      Cash machine 
 english 
'''


# 1、 alignment .
# print  It's a built-in function , For output . Console output .
# print("hello")# Under no special circumstances , The code is written in the top grid .
# # 2、 Line break . One sentence, one line .
# print("daydayup")

#  Use code to operate the browser .
from selenium import webdriver

# Open Google browser , Established a session with the browser .
#driver Variable = conversation .
driver=webdriver.Chrome()# Google Chrome's name is capitalized .
# Based on this conversation , Visit a web page .
#webdriver Is a third-party library . Provides a variety of web page operations API. That's the method .
# The method of accessing a web page is called get().
driver.get("https://www.elong.com/")#driver This variable does , Is based on webdriver.Chrome() This conversation .
# get() It's called .



'''
 Variable = value 
 Variable name ： Numbers / character （26 It's a case letter ）/_
        Start with a string , Underline stitching .
       my_name
 Variable names are never used in Chinese .
 The shopping cart ： Push / Pulling / Mentioned .


 Variable ： Variable = data . Integers / character string 
 A variable used to store data . One definition , Used multiple times .
 The shopping cart / Lockers --1 A Durian .
 The shopping cart =1 A Durian .
 Get durian , Find the shopping cart .
python Finding this variable in is equivalent to finding this data .
 Shopping cart can be visited many times .


 character string 、 character string , Is to connect the characters together , String in a string, string in a string ;
 The string can contain numbers 、 Letter 、 Special symbols, etc .


 stay Python Just add a pair of double quotation marks or a pair of single quotation marks to some contents ,
 The default is string ;（ Three pairs of single quotation marks or three pairs of double quotation marks can be used to write multiline strings ）.
'''


# gwc=" A Durian "# With double quotation marks , It's just a string .
# gwc=100
# money=99
# me=" beauty "

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