Python : Importing Modules

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# Importing Python Modules

LibreOffice Python scripts come in three distinct flavors, they can be personal, shared or embedded in documents. They are stored in varying places described in Python Scripts Organization and Location. In order to import Python modules, their locations must be known from Python at run time.

This mechanism is illustrated for file system based modules and document based modules. Exception handling is omitted for clarity. The terms library or directory, scripts or modules are used interchangeably. A Python macro refers to a function inside a module.

Note that <User Profile>/Scripts/python/pythonpath local directory is always explored when running a Python macro from <User Profile>/Scripts/python.

## File System module import

LibreOffice Basic libraries contain classes, routines and variables, Python modules contain classes, functions and variables. Common pieces of reusable Python or UNO features must be stored in My macros within (User Profile)/Scripts/python/pythonpath. Python libraries help organize modules in order to prevent module name collisions. Import uno.py inside shared modules.

### User or Shared Modules

Personal & shared Python scripts can be imported once their directories are included in Python run time path. Refer to Getting session information page for more details regarding omitted Session Class.

            # -*- coding: utf-8 -*-
            from __future__ import unicode_literals
            import sys

            user_lib = Session().UserPythonScripts  # User scripts location
            if not user_lib in sys.path:
                sys.path.insert(0, user_lib)  # Add to search path
            import screen_io as ui  # 'screen_io.py' module resides in user_lib directory
            # Your code follows here

This Python example exposes a local XSCRIPTCONTEXT variable to an imported module:

            # -*- coding: utf-8 -*-
            from __future__ import unicode_literals
            import uno, sys

            share_lib = Session.SharedPythonScripts()  # Shared scripts location
            if not share_lib in sys.path:
                sys.path.insert(0, share_lib)  # Add to search path
            from IDE_utils import ScriptContext  # 'IDE_utils.py' sits with shared Python scripts.
            XSCRIPTCONTEXT = ScriptContext(uno.getComponentContext)
            # Your code follows here

### Installation Modules for Applications

Unlike personal and shared scripts, LibreOffice installation scripts can be imported any time. Next to uno & unohelper LibreOffice Python modules, other scripts present in <installation_path>/program directory can be imported directly, such as the msgbox module.

With Python shell:

>>> import msgbox, uno

>>> myBox = msgbox.MsgBox(uno.getComponentContext())

>>> myBox.addButton("okay")

>>> myBox.renderFromButtonSize()

>>> myBox.numberOflines = 2

>>> print(myBox.show("A small message",0,"Dialog title"))

## Document Module Import

Importing a Python document embedded module is illustrated below. Error handling is not detailed. Python run time path is updated when document has been opened and before closure. Refer to Event-Driven Macros to learn how to associate Python macros to document events.

            # -*- coding: utf-8 -*-
            from __future__ import unicode_literals

            import sys, uno, zipimport

            def OnDocPostOpenLoadPython(event = None):
                """ Prepare Python modules import when doc. loaded """
                PythonLibraries.loadLibrary('lib/subdir')  # Add directory to search path
                PythonLibraries.loadLibrary('my_gui', 'screen_io')  # Add dir. & import screen_io

            def OnDocQueryCloseUnloadPython(event = None):
                """ Cleanup PYTHON_PATH when doc. Gets closed """
                PythonLibraries.unloadLibrary('my_gui')  # Python runtime path cleanup
                # Note: imported modules remain loaded in this example.

            class PythonLibraries():
                """ Python library loader and module importer

                adapted from 'Bibliothèque de fonctions' by Hubert Lambert
                at https://forum.openoffice.org/fr/forum/viewtopic.php?p=286213 """
                def isImportedModule(module_name: str) -> bool:
                    """ Check run time module list """
                    return (module_name in sys.modules.keys())
                def isLoadedLibrary(lib_name: str) -> bool:
                    """ Check PYTHON_PATH content """
                    url = uno.fileUrlToSystemPath(
                        f'{doc.URL}/Scripts/python/{lib_name}' )
                    return (url in sys.path)
                def loadLibrary(lib_name: str, module_name=None):
                    """ add directory to PYTHON_PATH, import named module """
                    doc = XSCRIPTCONTEXT.getDocument()
                    url = uno.fileUrlToSystemPath(
                        f'{doc.URL}/Scripts/python/{lib_name}' )
                    if not url in sys.path:
                        sys.path.insert(0, url)
                    if module_name and not module_name in sys.modules.keys():
                        return zipimport.zipimporter(url).load_module(module_name)
                def unloadLibrary(lib_name: str):
                    """ remove directory from PYTHON_PATH """
                    doc = XSCRIPTCONTEXT.getDocument()
                    url = uno.fileUrlToSystemPath(
                        f'{doc.URL}/Scripts/python/{lib_name}' )
                    sys.path.remove(url)

            g_exportedScripts = (OnDocPostOpenLoadPython, OnDocQueryCloseUnloadPython)

Närliggande ämnen

Getting Session Information

Programming with Python Scripts

Python Scripts Organization and Location

Refer to Creating a Python Listener for examples of event-driven macros.

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