pkgutil.iter_importers(fullname='')
Yield PEP 302 importers for the given module name.
If fullname contains a ‘.’, the importers will be for the package containing fullname, otherwise they will be all registered top level importers (i.e. those on both sys.meta_path and sys.path_hooks).
If the named module is in a package, that package is imported as a side effect of invoking this function.
If no module name is specified, all top level importers are produced.
Changed in version 3.3: Updated to be based directly on importlib
rather than relying on the package internal PEP 302 import emulation.
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