Currently, Spyder produces a list of lines marked with #TODO, which can be found under Source>Show todo list. Something similar exists for the errors/warnings.
However, accessing this is a pain if you want to go through several, or don't know which one you need, since the menue closes after each selection (it also doesn't seem to behave properly if you select multiple Todos/Warnings after each other, but I haven't done systematic testing there). It's also not possible to keep them in view while working, which would be quite useful for a Todo-list.
I suggest creating new panes for the Todos and Errors/Warnings. The basic functionality would just be to show the already existing list, and allow jumping to the line on left click. The outline and Breakpoints panes implement this already.
Nice additional features for the Todo pane would be deleting and editing from the pane, but that's secondary.
Good suggestion, but we don't have plans to implement something like this. However, you're welcome to send us a pull request if you want to see this as part of Spyder.
For information: I am working on this.
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For information: I am working on this.