Syntax highlighting for console sessions

It's a minor annoyance that comes up often in GitHub comments: syntax highlighting for Python console sessions. You want the input code (after the prompt) to be highlighted, but the output (which is generally just text or logs) to remain neutral. As far as I can tell, most people opt for one of two options: no highlighting at all (boring, can be harder to read), or Python syntax highlighting (looks nicer but probably makes all kinds of weird colors in your output).

Here's a classic example where the output includes a progress bar:

>>> my_str = "hello"
>>> some_int = 123
>>> func_with_output(a=1, b=my_str)
Processing: 100%|██████████████████| 10/10 [00:01<00:00,  9.71it/s]

We would like to spruce this up a bit with some syntax highlighting. If we start our code block with ```python instead of just the plain regular triple backticks (which start a code block in Markdown), we end up with something that looks like

>>> my_str = "hello"
>>> some_int = 123
>>> func_with_output(a=1, b=my_str)
Processing: 100%|██████████████████| 10/10 [00:01<00:00,  9.71it/s]

This is okay, but the progress bar looks silly and it makes it more difficult to tell what's input and what's output. However, there is actually another syntax highlighter specifically for this case: pycon (instead of python). it highlights lines that start with the Python prompt (>>>), but doesn't highlight output lines which don't have any prompt, leaving us with:

>>> my_str = "hello"
>>> some_int = 123
>>> func_with_output(a=1, b=my_str)
Processing: 100%|██████████████████| 10/10 [00:01<00:00,  9.71it/s]

As a bonus, for shell sessions (which usually have a less obvious prompt, making it more important to distinguish input from output), you can do the same thing using the console highlighter!

$ echo "output colored differently"
output colored differently

Perfection.