Python Basics 1 Basic syntax, Process Control

1. The first Python program:

Print ("Hello world!") Print Hello world! Run Result: Hello world!

2. Variables

variables, which are used to store things so that they can be called later.

Rules for defining variables:

A variable can be any combination of letters, numbers, or underscores

The first character of a variable cannot be a number

The variable name cannot make the keyword

Name = "Zhang"//Assign the Zhang to name name2 = name//Assign the value of name (Zhang) to name2 name = "Wang" Assign Wang to name print ("My name is", name,name2)//Output "My name is" and name separated by commas running results: My name is Wang Zhang

Add: Single line comment with #, multiline comment with 3 apostrophe or double quotation mark

3. User input

Username = input ("username:")//Enter a user name, assign to username password = input ("Password:") Age = Input ("Age:") salary = InP UT ("Salary") print (username,password,age,salary)//print out the above variables run result: XXL a1! 20 9999

4. Formatted output

  username = input ("Username:")   age  = input ("Age:")   job = input ("Job:")   salary = input (" Salary: ")   info = "                                   //put the format you want to output in three quotes, assign variables   ------------------- info of %s -------- ------------  Name:%s  Age:%s  Job:%s  Salary:%s   '  %   (username,username,age,job,salary)    print (info)      Run result:   username:xxl  age:12  job:1  salary:1234  -------------------  info of xxl --------------------  Name:xxl  Age:12  Job:1   salary:1234 

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Python Basics 1 Basic syntax, Process Control