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Today I Learned
in Python, `import a.b` will place a `b` attribute on `a` ... in effect inserting a global variable into `a/__init__.py`
that's moderately surprising
...it also turns out to be important in a low-memory environment (with micropython), because it makes it more difficult to unimport a module. sys.modules is not the only place that holds a reference
@matejcik TIL too..