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e f d � � YZ d e f d � � YZ d e f d � � YZ d Z d a d d � Z d � Z d S( s, Import hook support.
Consistent use of this module will make it possible to change the
different mechanisms involved in loading modules independently.
While the built-in module imp exports interfaces to the built-in
module searching and loading algorithm, and it is possible to replace
the built-in function __import__ in order to change the semantics of
the import statement, until now it has been difficult to combine the
effect of different __import__ hacks, like loading modules from URLs
by rimport.py, or restricted execution by rexec.py.
This module defines three new concepts:
1) A "file system hooks" class provides an interface to a filesystem.
One hooks class is defined (Hooks), which uses the interface provided
by standard modules os and os.path. It should be used as the base
class for other hooks classes.
2) A "module loader" class provides an interface to search for a
module in a search path and to load it. It defines a method which
searches for a module in a single directory; by overriding this method
one can redefine the details of the search. If the directory is None,
built-in and frozen modules are searched instead.
Two module loader class are defined, both implementing the search
strategy used by the built-in __import__ function: ModuleLoader uses
the imp module's find_module interface, while HookableModuleLoader
uses a file system hooks class to interact with the file system. Both
use the imp module's load_* interfaces to actually load the module.
3) A "module importer" class provides an interface to import a
module, as well as interfaces to reload and unload a module. It also
provides interfaces to install and uninstall itself instead of the
default __import__ and reload (and unload) functions.
One module importer class is defined (ModuleImporter), which uses a
module loader instance passed in (by default HookableModuleLoader is
instantiated).
The classes defined here should be used as base classes for extended
functionality along those lines.
If a module importer class supports dotted names, its import_module()
must return a different value depending on whether it is called on
behalf of a "from ... import ..." statement or not. (This is caused
by the way the __import__ hook is used by the Python interpreter.) It
would also do wise to install a different version of reload().
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This provides the same functionality as built-in import. It
doesn't deal with checking sys.modules -- all it provides is
find_module() and a load_module(), as well as find_module_in_dir()
which searches just one directory, and can be overridden by a
derived class to change the module search algorithm when the basic
dependency on sys.path is unchanged.
The interface is a little more convenient than imp's:
find_module(name, [path]) returns None or 'stuff', and
load_module(name, stuff) loads the module.
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This base class behaves just like the native filesystem.
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By defining suitable hooks, you might be able to load modules from
other sources than the file system, e.g. from compressed or
encrypted files, tar files or (if you're brave!) URLs.
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