Of course! Let's break down the situation with Aptana and Python 3.5.

The short answer is: Aptana Studio 3 is an aging IDE that does not have built-in, first-class support for modern Python development like Python 3.5. It was primarily designed for web development (HTML, CSS, JavaScript) and has very limited, often buggy, Python integration.

Here’s a detailed explanation of your options and the history.

The Problem with Aptana and Python

Aptana Studio 3's Python support comes from a third-party plugin called PyDev. While PyDev is a very capable and popular standalone Eclipse-based Python IDE, its integration into Aptana was always a bit of a tacked-on feature.

Here are the key issues you would face trying to use Python 3.5 in Aptana Studio 3:

• Outdated Base: Aptana Studio 3 itself hasn't had a major update in many years. It's built on an older version of the Eclipse platform, which means it's not compatible with modern Python tooling.
• No Built-in Linter/Formatter: Modern Python development relies heavily on linters (like Flake8, Pylint) and formatters (like Black, Autopep8) to enforce code style and catch errors. Aptana/PyDev does not have easy, integrated setup for these tools. You would have to run them manually from the command line.
• Clunky Virtual Environment Management: Creating and managing virtual environments (venv) is cumbersome. You have to do it manually outside of Aptana and then point the project to the interpreter, which is not as seamless as in modern IDEs.
• No Integrated Debugger (or a poor one): The debugging experience is often unreliable. It can be difficult to set breakpoints, and you may encounter strange bugs or crashes.
• No Modern Refactoring Tools: IDEs like PyCharm and VS Code offer powerful, safe refactoring tools (rename method, extract variable, etc.). The support for these in PyDev/Aptana is minimal.
• Lack of Package Management Integration: There's no easy way to run pip install from within the IDE. You have to use a terminal outside of Aptana.

In short, while you can technically configure Aptana to run a Python 3.5 script, you will be missing out on the vast majority of the tools that make modern Python development productive and enjoyable.

How to (Attempt) to Set it Up in Aptana

If you still want to try, here are the general steps. This is for educational purposes to show the limitations.

1. Install Python 3.5: Make sure Python 3.5 is installed on your system and is in your system's PATH.
2. Install Aptana Studio 3: Download and install the latest version of Aptana Studio 3 (which is quite old).
3. Configure the Python Interpreter:
   • Go to Window -> Preferences -> PyDev -> Interpreter - Python.
   • Click New and point it to your Python 3.5 executable (e.g., C:\Python35\python.exe on Windows or /usr/bin/python3.5 on Linux).
   • Aptana will scan your Python installation and build a library list. This can take a while.
4. Create a Python Project:
   • Go to File -> New -> PyDev Project.
   • Give your project a name and make sure the "Grammar Version" is set to Python 3.5.
   • Select the interpreter you configured in the previous step.
5. Write and Run Code: You can now create .py files and run them using the "Run As" -> Python Run option.

You will quickly notice the limitations mentioned above. The code completion might be basic, and you won't get helpful warnings about code style or potential bugs.

Modern, Recommended Alternatives for Python 3.5

This is the strongly recommended path. Using a modern IDE will make your life infinitely easier.

Option 1: PyCharm (The Gold Standard for Python)

PyCharm is developed by JetBrains, the same company that makes IntelliJ IDEA. It is considered the best IDE for Python development.

• PyCharm Community Edition: Free, open-source, and more than powerful enough for Python 3.5 development. It includes:
  • A world-class, integrated debugger.
  • Excellent code completion and inspection.
  • Built-in support for Git and other version control systems.
  • Integrated terminal for running pip and venv.
  • Easy setup of linters (Flake8, Pylint) and formatters (Black).
  • One-click virtual environment creation and management.
• PyCharm Professional: Paid version, which adds support for web frameworks like Django, Flask, scientific tools (Jupyter, Matplotlib), and database tools.

Recommendation: Download PyCharm Community Edition. It is the perfect replacement for Aptana for Python development.

Option 2: Visual Studio Code (VS Code) (The Modern Favorite)

VS Code is a free, lightweight, and highly extensible code editor from Microsoft. It has become one of the most popular choices for Python development due to its speed and flexibility.

• How it works: You install the base VS Code application and then install the official Python extension from Microsoft.
• Key Features:
  • IntelliSense: Provides intelligent code completion, linting, and debugging.
  • Jupyter Notebook Support: Excellent for data science and interactive coding.
  • Integrated Terminal: A terminal is built right into the editor.
  • Huge Ecosystem: Thousands of extensions for everything from Docker to theme customization.
  • Great Git Integration.
• Setup: After installing VS Code, go to the Extensions view (Ctrl+Shift+X), search for "Python," and install the one published by Microsoft.

Recommendation: Download Visual Studio Code. It's incredibly popular, free, and a joy to use. Many developers find it to be the perfect balance between a lightweight editor and a full-featured IDE.

Summary Table

Final Verdict: You should absolutely migrate away from Aptana for Python development. Both PyCharm and VS Code are modern, powerful, and free tools that will make working with Python 3.5 (or any modern version) a much better experience.