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how to avoid importing the same module more than once?

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Greetings,

When breaking up a large program into several different modules, I'm 
wondering if there is any way to avoid importing the same global modules 
more than once, as I'm sure this is degrading performance.

For example, if I have a program which uses the "os" built-in module
and imports two custom modules which also use "os", then I end up
running "import os" three times!

Regards,
Graham

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