python-basics-basics-variables-select-loop

1 Basic knowledge

1.1 Classification of annotations

 

1.2 Variables and Types

　　Variable definitions

    num1 = 100 #num1就是一个变量，就好一个小菜篮子

    num2 = 87  #num2也是一个变量

    result = num1 + num2 #把num1和num2这两个"菜篮子"中的数据进行累加，然后放到 result变量中

 　　variable type

　　

Note: How do you know the type of a variable?

• • In python, as long as a variable is defined and it has data, its type is already determined, and we do not need our developers to actively explain its type, the system will automatically identify it
  • You can use type (the name of the variable) to see the type of the variable

1.3 Input and output

output

　　normal output

　　

  # print hint
    print('hello world')
    print( ' Give me the card---Hindi, hello ' )

格式化输出


　　

enter

1.4 Operators and data type conversions

 

2 Selection and judgment

2.1 Selection

 

 

2.2 Cycle