well, in my opinion python is not trying hard enough. to me it is immediately obvious that the main module gets evaluated twice and i am rather sure that one could introduce some magic of the kind "oh, i reevaluate the main script here, the module does not get filled the usual way but uses the existing objects instead". this would have to happen on a very low level (when the file i just read from is known) but i think it would be possible. whether the effort to do so is worth it, is a different question...
There is an easy fix to this situation, and it's called creating a new script that imports the modules. If it's truely a module (which I guess really everything in python is), it probably should only be run by itself for testing purposes only.
Now i wonder how difficult it would be to "correct" the behavior?
there's no way to "fix" it without introducing a huge number of inconsistencies.
Plus, it's not broken to begin with.
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