What key quality characteristics do you prioritize when launching a new project?

When starting a new Python project, the following key quality characteristics are primarily evaluated:

• Code readability and maintainability — how understandable the code is to other developers, whether coding standards (PEP8) are followed.
• Testability — presence of unit and integration tests, ease of covering the code with tests.
• Performance — how efficiently the code runs, especially if the project involves processing large data or high load.
• Security — vulnerability checks, proper data and exception management.
• Scalability and extensibility — the project architecture should allow adding new features without major changes.

For example, it is immediately advisable to set up a testing system (pytest), linters (flake8), and version control system to ensure quality from the very beginning.