Python Library Reference

Previous: 3.20.3 Available Functions Up: 3. Python Runtime Services Next: 3.21.1 Examples

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3.21 imp -- Access the import internals

Thismodule provides an interface to the mechanisms used to implement the import statement. It defines the following constants and functions:

get_magic()

Return the magic string value used to recognize byte-compiled code files (.pyc files). (This value may be different for each Python version.)

get_suffixes()

Return a list of triples, each describing a particular type of module. Each triple has the form (suffix, mode, type), where suffix is a string to be appended to the module name to form the filename to search for, mode is the mode string to pass to the built-in open() function to open the file (this can be 'r' for text files or 'rb' for binary files), and type is the file type, which has one of the values PY_SOURCE, PY_COMPILED, or C_EXTENSION, described below.

find_module(name[, path])

Try to find the module name on the search path path. If path is a list of directory names, each directory is searched for files with any of the suffixes returned by get_suffixes() above. Invalid names in the list are silently ignored (but all list items must be strings). If path is omitted or None, the list of directory names given by sys.path is searched, but first it searches a few special places: it tries to find a built-in module with the given name (C_BUILTIN), then a frozen module (PY_FROZEN), and on some systems some other places are looked in as well (on the Mac, it looks for a resource (PY_RESOURCE); on Windows, it looks in the registry which may point to a specific file).

If search is successful, the return value is a triple (file, pathname, description) where file is an open file object positioned at the beginning, pathname is the pathname of the file found, and description is a triple as contained in the list returned by get_suffixes() describing the kind of module found. If the module does not live in a file, the returned file is None, filename is the empty string, and the description tuple contains empty strings for its suffix and mode; the module type is as indicate in parentheses above. If the search is unsuccessful, ImportError is raised. Other exceptions indicate problems with the arguments or environment.

This function does not handle hierarchical module names (names containing dots). In order to find P.M, i.e., submodule M of package P, use find_module() and load_module() to find and load package P, and then use find_module() with the path argument set to P.__path__. When P itself has a dotted name, apply this recipe recursively.

load_module(name, file, filename, description)

Load a module that was previously found by find_module() (or by an otherwise conducted search yielding compatible results). This function does more than importing the module: if the module was already imported, it is equivalent to a reload()! The name argument indicates the full module name (including the package name, if this is a submodule of a package). The file argument is an open file, and filename is the corresponding file name; these can be None and '', respectively, when the module is not being loaded from a file. The description argument is a tuple, as would be returned by get_suffixes(), describing what kind of module must be loaded.

If the load is successful, the return value is the module object; otherwise, an exception (usually ImportError) is raised.

Important: the caller is responsible for closing the file argument, if it was not None, even when an exception is raised. This is best done using a try ... finally statement.

new_module(name)

Return a new empty module object called name. This object is not inserted in sys.modules.

The following constants with integer values, defined in this module, are used to indicate the search result of find_module().

PY_SOURCE

The module was found as a source file.

PY_COMPILED

The module was found as a compiled code object file.

C_EXTENSION

The module was found as dynamically loadable shared library.

PY_RESOURCE

The module was found as a Macintosh resource. This value can only be returned on a Macintosh.

PKG_DIRECTORY

The module was found as a package directory.

C_BUILTIN

The module was found as a built-in module.

PY_FROZEN

The module was found as a frozen module (see init_frozen()).

The following constant and functions are obsolete; their functionality is available through find_module() or load_module(). They are kept around for backward compatibility:

SEARCH_ERROR

Unused.

init_builtin(name)

Initialize the built-in module called name and return its module object. If the module was already initialized, it will be initialized again. A few modules cannot be initialized twice -- attempting to initialize these again will raise an ImportError exception. If there is no built-in module called name, None is returned.

init_frozen(name)

Initialize the frozen module called name and return its module object. If the module was already initialized, it will be initialized again. If there is no frozen module called name, None is returned. (Frozen modules are modules written in Python whose compiled byte-code object is incorporated into a custom-built Python interpreter by Python's freeze utility. See Tools/freeze/ for now.)

is_builtin(name)

Return 1 if there is a built-in module called name which can be initialized again. Return -1 if there is a built-in module called name which cannot be initialized again (see init_builtin()). Return 0 if there is no built-in module called name.

is_frozen(name)

Return 1 if there is a frozen module (see init_frozen()) called name, or 0 if there is no such module.

load_compiled(name, pathname, file)

Load and initialize a module implemented as a byte-compiled code file and return its module object. If the module was already initialized, it will be initialized again. The name argument is used to create or access a module object. The pathname argument points to the byte-compiled code file. The file argument is the byte-compiled code file, open for reading in binary mode, from the beginning. It must currently be a real file object, not a user-defined class emulating a file.

load_dynamic(name, pathname[, file])

Load and initialize a module implemented as a dynamically loadable shared library and return its module object. If the module was already initialized, it will be initialized again. Some modules don't like that and may raise an exception. The pathname argument must point to the shared library. The name argument is used to construct the name of the initialization function: an external C function called "initname()" in the shared library is called. The optional file argument is ignored. (Note: using shared libraries is highly system dependent, and not all systems support it.)

load_source(name, pathname, file)

Load and initialize a module implemented as a Python source file and return its module object. If the module was already initialized, it will be initialized again. The name argument is used to create or access a module object. The pathname argument points to the source file. The file argument is the source file, open for reading as text, from the beginning. It must currently be a real file object, not a user-defined class emulating a file. Note that if a properly matching byte-compiled file (with suffix .pyc or .pyo) exists, it will be used instead of parsing the given source file.

• 3.21.1 Examples

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Python Library Reference

Previous: 3.20.3 Available Functions Up: 3. Python Runtime Services Next: 3.21.1 Examples

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Release 2.1.1, documentation updated on July 20, 2001.

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