Seasonal change 48 / 90

Random thoughts on programming

Python list

list=["a","b","c"]
// Traverse the list 
for item in list:
  print(item)

Python Dictionaries

dic={"Baotou":" Mongolia B","Huhehaote":" Mongolia A"}print(dic["Huhehaote"])
// Ergodic dictionary 
for key,value in dic.items():  
  print(key)  
  print(value)

Python object-oriented

// Define the object 
class Song():    
  def __init__(self,lyrics):        
    self.lyrics=lyrics    
  def sing(self):        
    print(self.lyrics)
// Instantiation 
song = Song("you and me")
song.sing()

‍Bash set command

1. set -u // If you encounter a variable that doesn't exist, you will report an error , And stop executing .
2. set -x // Used before running the results , First output the line of command executed .
3. set -e // Make the script as long as an error occurs , On termination of execution .
4. set -o pipefail // As long as one subcommand fails , The whole pipeline command fails , The script will terminate execution .
5. set -v // Means to print  Shell  Every line of input received .
6. set -Eeuxo pipefail //set Parameter combination 
7. bash -euxo pipefail script.sh // perform  Bash  Script time , Pass in these parameters from the command line .