PyCharm (pro)

• great editor designed specifically for Python and python apps
• complex (good for configurability, bad for simplicity)
• expensive ($200 first year, $120 third year)

PyCharm (free)

• same as above but without a REST client or support for other web development tools (which you will likely end up using)
• ok to get your feet wet (you can always upgrade later) Full comparison: https://www.jetbrains.com/pycharm/features/editions_comparison_matrix.html

VS Code (free)

• Configurable "IDE" with support for most modern languages
• TONS of simple-to-install extensions that add functionality
• Great docs and UI

Sublime Text (free)

• one of the most minimal editors out there
• it just works

It's really down to personal preference. But I would recommend downloading all of the FREE editors, getting setup in each, and keeping only the ones you like.

My personal choice for web development is VS Code but I started with Pycharm (free), and use Sublime text on occasion.

Just focus on learning and developing and you will find what features you're looking for.