Interacting With Python :

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November 18, 2024
Interacting With Python
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There are multiple ways of interacting with Python, and each can be useful for different scenarios. You can quickly explore functionality in Python’s interactive mode using the built-in Read-Eval-Print Loop (REPL), or you can write larger applications to a script file using an editor or Integrated Development Environment (IDE).

In this tutorial, you’ll learn how to:

  • Use Python interactively by typing code directly into the interpreter
  • Execute code contained in a script file from the command line
  • Work within a Python Integrated Development Environment (IDE)
  • Assess additional options, such as the Jupyter Notebook and online interpreters

Before working through this tutorial, make sure that you have a functioning Python installation at hand. Once you’re set up with that, it’s time to write some Python code!

Take the Quiz: Test your knowledge with our interactive “Interacting With Python” quiz. You’ll receive a score upon completion to help you track your learning progress:

Interacting With Python

Interactive Quiz

Interacting With Python

In this quiz, you'll test your understanding of the different ways of interacting with Python. By working through this quiz, you'll revisit key concepts related to Python interaction in interactive mode using the REPL, through Python script files, and within IDEs and code editors.

Hello, World!

There’s a long-standing custom in computer programming that the first code written in a newly installed language is a short program that displays the text Hello, World! to the console.

In Python, running a “Hello, World!” program only takes a single line of code:

Python 
print("Hello, World!")

Here, print() will display the text Hello, World! in quotes to your screen. In this tutorial, you’ll explore several ways to execute this code.

Running Python in Interactive Mode

The quickest way to start interacting with Python is in a Read-Eval-Print Loop (REPL) environment. This means starting up the interpreter and typing commands to it directly.

When you interact with Python in this way, the interpreter will:

  • Read the command you enter
  • Evaluate and execute the command
  • Print the output (if any) to the console
  • Loop back and repeat the process

The interactive session continues like this until you instruct the interpreter to stop. Using Python in this interactive mode is a great way to test short snippets of Python code and get more familiar with the language.

When you install Python using an installer, the Start menu shows a program group labeled Python 3.x. The label may vary depending on the particular installation you chose. Click on that item to start the Python interpreter.

Alternatively, you can open your Command Prompt or PowerShell application and type the py command to launch it:

Windows PowerShell 
PS> py

To start the Python interpreter, open your Terminal application and type python3 to launch it from the command line:

Shell 
$ python3

If you’re unfamiliar with this application, then you can use your operating system’s search function to find it.

After pressing Enter, you should see a response from the Python interpreter similar to the one below:

Python 
Python 3.13.0 (main, Oct 14 2024, 10:34:31) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

If you’re not seeing the >>> prompt, then you’re not talking to the Python interpreter. This could be because Python is either not installed or not in the path of your terminal window session.

If you’re seeing the prompt, then you’re off and running! With these next steps, you’ll execute the statement that displays "Hello, World!" to the console:

  1. Ensure that Python displays the >>> prompt, and that you position your cursor after it.
  2. Type the command print("Hello, World!") exactly as shown.
  3. Press the Enter key.

Read the full article at https://realpython.com/interacting-with-python/ »

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November 18, 2024 at 07:30PM
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