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Python Tutorial

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Learn Python

Python is a popular programming language.

Python can be used on a server to create web applications.

Start learning Python now »


Learning by Examples

With our "Try it Yourself" editor, you can edit Python code and view the result.

Example

print("Hello, World!")

Try it Yourself »

Click on the "Try it Yourself" button to see how it works.


Python File Handling

In our File Handling section you will learn how to open, read, write, and delete files.

Python File Handling


Python Database Handling

In our database section you will learn how to access and work with MySQL and MongoDB databases:

Python MySQL Tutorial

Python MongoDB Tutorial


Python Exercises

Test Yourself With Exercises

Exercise:

Insert the missing part of the code below to output "Hello World".

("Hello World")

Start the Exercise



Python Examples

Learn by examples! This tutorial supplements all explanations with clarifying examples.

See All Python Examples


Python Quiz

Test your Python skills with a quiz.

Python Quiz


My Learning

Track your progress with the free "My Learning" program here at W3Schools.

Log into your account, and start earning points!

This is an optional feature, you can study W3Schools without using My Learning.

Hướng dẫn dùng w3schools python python


Python Reference

You will also find complete function and method references:

Reference Overview

Built-in Functions

String Methods

List/Array Methods

Dictionary Methods

Tuple Methods

Set Methods

File Methods

Python Keywords

Python Exceptions

Python Glossary

Random Module

Requests Module

Math Module

CMath Module


Download Python

Download Python from the official Python web site: https://python.org


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Python Install

Many PCs and Macs will have python already installed.

To check if you have python installed on a Windows PC, search in the start bar for Python or run the following on the Command Line (cmd.exe):

C:\Users\Your Name>python --version

To check if you have python installed on a Linux or Mac, then on linux open the command line or on Mac open the Terminal and type:

If you find that you do not have Python installed on your computer, then you can download it for free from the following website: https://www.python.org/


Python Quickstart

Python is an interpreted programming language, this means that as a developer you write Python (.py) files in a text editor and then put those files into the python interpreter to be executed.

The way to run a python file is like this on the command line:

C:\Users\Your Name>python helloworld.py

Where "helloworld.py" is the name of your python file.

Let's write our first Python file, called helloworld.py, which can be done in any text editor.

Simple as that. Save your file. Open your command line, navigate to the directory where you saved your file, and run:

C:\Users\Your Name>python helloworld.py

The output should read:

Congratulations, you have written and executed your first Python program.



The Python Command Line

To test a short amount of code in python sometimes it is quickest and easiest not to write the code in a file. This is made possible because Python can be run as a command line itself.

Type the following on the Windows, Mac or Linux command line:

C:\Users\Your Name>python

Or, if the "python" command did not work, you can try "py":

From there you can write any python, including our hello world example from earlier in the tutorial:

C:\Users\Your Name>python
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.

>>> print("Hello, World!")

Which will write "Hello, World!" in the command line:

C:\Users\Your Name>python
Python 3.6.4 (v3.6.4:d48eceb, Dec 19 2017, 06:04:45) [MSC v.1900 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> print("Hello, World!")

Hello, World!

Whenever you are done in the python command line, you can simply type the following to quit the python command line interface: