the difference of "exec" and "import" in python

[tom z]

Hi~ all guys,
I have a strange question, what's the difference of "exec" and "import"?
IMO, when we use "import", the script is also be executed, (maybe its
namespace is owned by itself), and "exec" does something like this, it
executes some script. So i think its difference is its namespace.
I want to get your hint~

thanks a lot
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