Where is the python interpreter installed?

Interpreter (English: Interpreter), also translated as interpreter, is a computer program that can directly translate and run high-level programming languages ​​line by line. The interpreter does not translate the entire program at once. It is just like a "middleman". Every time the program is run, it must be converted into another language before running. Therefore, the interpreter program runs relatively slowly. Every time it translates a line of program description, it runs immediately, then it translates the next line, runs it again, and so on.

Goal

Install Python interpreter

Preparation

1.Windows Explorer

Display file extensions and display hidden files. Suffix: .txt.word.py

Uncheck Hide extensions for known file types.

Related recommendations: "Python Video Tutorial"

Download

1. First open the Python official website and find the location shown in the picture. (Python download website: Python official website http://www. python.org)

(Understand) Version selection

Python3.7.0

3: Major version

7: Minor version

0: Minor version update (minor version)

We use the Python3 major version that we usually download Pay attention to the second digit of the small version

The small version number should be as large as possible

b represents the bate test version; rc is the version to be released;

means nothing is added after the version Official version available for download.

We choose a relatively new and stable version.

Windows x86 means 32-bit. x86-64 or amd64 means 64-bit.

web-based online installation; executable executable installation program

.exe; zip compressed package. We choose .exe. `

Finally choose python3.6.6-x86-

Install

Open the exe

Check "add python to path ", select custom installation.

optional features Select all

advanced option Check "add Python to environment variables."

install installation, close the dialog box after success.

(Understand) the role of the folders in the installation directory

-document documents, instructions.

-library library

-scripts script

-Python.exe Python interpreter entry point

-Pythonw.exe compilation

helloworld

Double-click Python.exe to open the python interactive book command line.

Command line: non-graphical control interface. Interactive: Run the code we type all the time, the feature

starts with "》》》".

Type print ("hello world"), press Enter, and use English symbols.

cmd and environment variables

Open the windows terminal (cmd) Command-based interface is lower level than graphical interface.

win7 User Start/Accessories/Command Prompt;

(Quickly open the command prompt windows r to open run, enter "cmd" and press Enter to open the command line.)

2. Enter python to enter the Python environment

(understand) environment variables

1. The environment variables of windows are some configurations, which will be loaded when the system starts. .

2. The system variables in the environment variables are global, and the user variables are personalized.

3. Environment variables are a bit like desktop shortcuts, which record some paths.

Each path is separated by "; (semicolon)". When we execute it in the command line When a xxx.exe program is

, the system will search for these paths, and when there is such a program, it will be called.

4. If environment variables are not added when Python is installed, you need to add them manually for ease of use.

5. After installing the Python interpreter or modifying it, you need to restart the computer to take effect. (There is an environment without restarting

Variables take effect)

windows cmd terminal and Python interpreter

windows cmd terminal:

Related to the Windows operating system, for example, the ping command feature is "path".

Python interactive terminal: specially designed to run Python code commands. feature is""""".

3. Windows Terminal Type "Python" on the keyboard to enter the Python terminal.

4 .Python terminal Type "exit()" to return to the Windows terminal.

(Key points) Two ways to run code

Python interactive interpreter. Advantages: fast feedback. Disadvantages: Not suitable for editing large files.

Edit our code in the .py file. Running mode: "

under windows terminal, "python hello.py"". Advantages: Suitable for running or editing large files.

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