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Import utilities
Exported classes:
ImportManager Manage the import process
Importer Base class for replacing standard import functions
BuiltinImporter Emulate the import mechanism for builtin and frozen modules
DynLoadSuffixImporter
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%c C sz | s | j d � r d S| d } | d r@ t j | } | S| j d � } | d k r_ d S| | } t j | } | S( sJ Returns the context in which a module should be imported.
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meaning there is no context -- the module should be looked for as a
"top-level" module.
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