PyCon: Evangelizing Python

So set up your editor that your tabs actually do the same thing, visually, that Python thinks they do logically. Simple.
Or tell your editor to not use tabs at all. Again, simple.
Or tell your editor not to use spaces (i.e. ony Python indent == 1 tab) and make the tabs wide enough that you can't miss any misalignment.

The Python community has more-or-less agreed on the second option; personally I strongly prefer the third. But that's as much bikeshedding as whether a C open brace goes on the same line as the if statement, or below it (and if so, which indent does it get?)

This kind of mistake (mixing up tabs and spaces) is so easy to check for that Python actually has an option for it. Which C compiler checks for "wrong" indentation on nested statements?