Learning Diary | 5.18 [Python3] Python3 basics and Object-oriented

Note: This is a series of network training based on the experimental Python learning diary, the content is scattered, just for my own review, it is necessary to understand www.shiyanlou.com.

1. GitHub-related

The first is to review GitHub related operations:

1.1 Complete creation of accounts and warehouses

Log in to github.com, create new repository, and initialize readme.md automatically.

1.2 Using Ssh-keygen to generate a public private key

The recommended key is saved in the default location: Terminal input Ssh-keygen, the default Save key location is/home/shiyanlou/.ssh/id_rsa, all the way to enter. Then use Ls-a to see the hidden files, enter. SSH you can see two files named Id_rsa (private key) and id_rsa.pub (public key).

Open the SSH and GPG keys item in GitHub user settings and paste the public key contents into it.

1.3 Configuring Git Tools

1 git--version                              # Check whether git has been installed2 sudo apt-get install git-y                # install git3 git con Fig--global user.name "username"   # For example, xxxx01014 git config--global user.email "useremail"  
     

Open GitHub's repository, copy the SSH link to the Clipboard, and enter the following command:

1 CD "Yourfolder" 2 git clone "xxxxxxxxxx"   # Copied link 3 cd "Yourreponame" 4 # Create with Echo or touch 5 # Then
   
     add these new files 6 git add "newfilename" 7 # Delete file 8 git rm "Somefile" 9 # Restore the file11 git reset--
    
     # commit after change14 git commit-m "Your activity/change description" # use M when commit for the first time  15 # then
      push, and change the repo17 git push-#check the CHANGES20 git fetch Origin   
    
   

2. Experimental 3:python Basic grammar

Create a file with Vim circle.py and edit:

#!/usr/bin/env python3# The first line is called Shebang, telling the Shell to use Python3 to execute the code
From math import pi# calculateresult = 5 * 5 * piprint (Result) 

When you are finished, enter chmod +x circle.py to add permissions and use./circle.py to execute.

Enter multiple lines of string using three "to resolve.

Strip () Remove the end-to-end, split () cut word.

Break represents a stop cycle, and continue represents skipping the current wheel loop.

Using try except finally catches the exception, and finally is the code that executes regardless of the situation, for example:

filename = '/etc/protocols 'f = open (filename) try:    f.write (' Shiyanlou ') except:    print (" File write Error ") finally: print (" finally ") f.close ()       

Query the module search path using the following method:

Import Syssys.path

Each of the. py files is a module.

If you want to identify a folder as a package, this folder needs to have __init__.py files, the content can be empty, you can use the Import folder (package) name. File (module) name to introduce.

Get "command line arguments" with the sys.argv of the SYS module:

#!/usr/bin/env python3import sysprint(len (SYS.ARGV)) for Arg in sys.argv:    print (ARG)  

Execution Result:

$ python3 argtest.py Hello shiyanlou3argtest.py     # argv[0]         Hello          # Argv[1]shiyanlou      # Argv[2]

The __name__ property of each Python file defaults to its own file name without the. Py form, such as Hello.py's __name__ property is hello. When executing this file with the Python interpreter in the terminal, the value of __name__ becomes __main__. When this file is poured into another file as a module, __name__ remains the default.

Learning Diary | 5.18 [Python3] Python3 basics and Object-oriented