Basic Learning for Python

The   location of query Python under Windows  which Python   query python version  python-v   lists the files in the current directory dir   switch directory CD

1 . Python interactive mode

1. Command line go directly to type Python
2. Run the idle new. py Format File

2, the development process of Python

1. Create a file that ends with a./py
   
2. At the command line, type python+ file name. py Execute python file

3. How to install Ipython
Pip install Ipython [all]

4. python

python print("this is my son") print("my name is" + "xutonghui") #字符串可以使用加号拼接，拼接内容仅限字符串 print("i am ok","thank you") #字符串可以使用逗号隔开

Naming rules

Letters, numbers, underscores
Cannot start with a number
Naming to make sense
Strictly case-sensitive
Cannot use identifiers and keywords (identifiers are custom, keywords are self-brought)

Python is a strongly typed, dynamic type of language

强类型是指语法严格，动态类型就是定义变量时不需要标识类型
Assignment of variables =

Check the type of variable ()

num1=123print(type(num1))

Determining the literal value of a variable

num1=123num2=121print(num1==num2)#最后返回的值  true或false

Determine if the address value of the referenced object is the same

num1=345num2=345printis num2)#最后返回的值  true或false

Address value ID of the instrumented object ()

num1=kkkprint(id(num1))

Basic Learning for Python