Preserving program structure

[David Dawkins]

So I'm using IDLE, and Alt-F5 tells me I have a problem with
indentation.

It seems I had (inadvertently) mixed tab and space characters.
No amount of "tabbifying" and "untabbifying" resolved the issue,
so I had to shift *everything* to the left-margin, and re-create
the indentation with a consistent scheme (8 space hard tabs).

While doing so, I stuffed up a lot of the program logic, because
it wasn't always obvious which block a particular statement
belonged in.  This dismayed me intensely.

How do experienced Python programmers avoid this problem?
I don't see much code out there with comments like "# endif", etc.

David
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david_j_dawkins /*AT*/ hotmail.com