Python reference note4 - The import system
13 Jul 2015
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the
importstatement combines two operations; it searchs for the named module, then it bind the result of that search to a name in the local scope. the search operation of the import statement is defined as a call to the__import__()funtion, with the appropriate arguments. the return value of__import__()is used to perform the name binding operation of the import statement. -
it's important to keep in mind that all packages are modules, but not all modules are packages.
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namespce package. ** what the hell, man **
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the first place checked during import search is
sys.module. this mapping serves as a cache of all modules that have been previously imported, including the intermediate paths(e.g.foo.bar.baz->foo,foo.bar,foo.bar.baz). -
if you keep a reference to the module object, invalidate its cache entry in
sys.modules, and then re-import the named module. the two module objects will not be the same. -
__spec__need reread. (what's the usage of it?)
转载的话就看不到更新了 :/
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