Many PCs and Macs already have Python installed. To check this, search for “Python” or type the following at the command line (cmd.exe):
To check on Linux or Mac, open a command prompt on Linux or open a terminal on Mac and type:
In case you find that python is not installed on your computer, you can download and install it using the instructions in this section.
Quick Start Python
Python is an interpreted programming language, which means that in development you create Python files (.py) in a text editor and then put those files into a python interpreter to run code. The way to run a python file is similar to the command line:
Where “helloworld.py” is the name of your python file. Let’s create our first Python file, called helloworld.py and write the code in it:
Save the file. Open your command line, go to the directory where you saved the file, and run it:
As a result, you should get:
Congratulations, you have written and executed your first Python program.
The Python command line
To test a small amount of code in python, it is sometimes easier and faster not to write code to a file. This is made possible because Python can run as a command line itself. Type the following command at the Windows, Mac, or Linux command prompt:
python or python3
From there, you can write any python code you want, including our welcome example:
C:\Users\\_Your Name_> python Python 3.8.5 (tags/v3.8.5:580fbb0, Jul 20 2020, 15:57:54) [MSC v.1924 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> print("Hello, World!")
On the command line of which you will see “Hello, World!
>>> hello, world!
When you are done with the python command line, you can simply type the following to exit the python shell: