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136 lines
6.3 KiB
Python
136 lines
6.3 KiB
Python
## @file
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# @brief Documentation file for GnuCashs python bindings, input file for doxygen.
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#
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# This file holds the more explanatory parts of the doxygen-source-documentation.
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# You will find the contents at @ref python_bindings_page.
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#
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# @par To-Do:
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# @li Work out the relation of scheme/guile and python-bindings
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# @li maybe join python_bindings_page and group
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# @li work on the structure of the documentation to make it more clear
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# @li try to make SWIG include the documentation of the c-source
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# @li make function-links in SWIG-generated files work.
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# @li some words to the tests
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#
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# @author Christoph Holtermann
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# @date December 2010
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# @ingroup python_bindings
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## @defgroup python_bindings Python Bindings Module
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# Also have a look at the page @ref python_bindings_page.
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## @defgroup python_bindings_examples Python Bindings Examples Module
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# @ingroup python_bindings
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# The python-bindings come with quite a lot of example scripts.
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## @page python_bindings_page Python bindings
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# Also have a look at group @ref python_bindings.
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#
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# In the source tree they are located at bindings/python.
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#
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# To enable them in the compilation process you have to add -DWITH_PYTHON=ON
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# to the call of cmake.
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#
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# As a starting point have a look at the \link python_bindings_examples example-scripts\endlink.
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#
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# @section possibilities What can Python Bindings be used for ?
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#
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# The python bindings supply the ability to access a wide range of the core functions of GnuCash. You
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# can read and write Transactions, Commodities, Lots, access the business stuff... You gain the ability
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# to manipulate your financial data with a flexible scripting language.
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#
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# Not everything GnuCash can is possible to access though. The bindings focus on basic accounting functions.
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# Have a look at the examples to get an impression.
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#
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# Some functions are broken because they have not been wrapped properly. They may crash the program or return unaccessible values.
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# Please file a bug report if you find one to help support the development process.
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#
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# @section python_bindings_section Principles
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# The python-bindings are generated using SWIG from parts of the source-files of GnuCash.
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#
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# @note Python-scripts should not be executed while GnuCash runs. GnuCash is designed as
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# a single user application with only one program accessing the data at one time. You can force your
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# access but that may corrupt data. Maybe one day that may change but for the moment there is no active development on that.
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#
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# @subsection swigworks What SWIG does
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#
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# SWIG extracts information from the c-sources and provides access to the structures
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# to python. It's work is controlled by interface files :
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#
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# @li gnucash_core.i
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# @li timespec.i
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# @li glib.i
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# @li @link base-typemaps.i src/base-typemaps.i @endlink This file is shared with Guile.
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#
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# it outputs:
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#
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# @li gnucash_core.c
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# @li gnucash_core_c.py
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#
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# If you have generated your own local doxygen documentation (by "make doc") after having compiled the python-bindings, doxygen
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# will include SWIGs output-files.
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# It's actually quite interesting to have a look at them through doxygen, because they contain all that you can
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# access from python.
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#
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# This c-style-api is the bottom layer. It is a quite raw extract and close to the original source. Some more details are described further down.
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#
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# For some parts there is a second layer of a nice pythonic interface. It is declared
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# in
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# @li gnucash_core.py and
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# @li gnucash_business.py.
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# @li function_class.py contains helper functions for that.
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#
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# @section howto How to use the Python bindings
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# @subsection highlevel High level python wrapper classes
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# If you
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#
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# @code >> import gnucash @endcode
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#
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# You can access the structures of the high level api. For Example you get a Session object by
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#
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# @code >> session=gnucash.Session() @endcode
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#
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# Here you will find easy to use things. But sometimes - and at the current level rather sooner than
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# later - you may be forced to search for solutions at the :
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#
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# @subsection c_style_api C-style-api
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#
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# If you
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#
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# @code >> import gnucash @endcode
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#
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# The c-style-api can be accessed via gnucash.gnucash_core_c. You can have a look at all the possibilities
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# at gnucash_core_c.py.
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#
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# You will find a lot of pointers here which you can just ignore if input and output of the function have the
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# same type.
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#
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# For example you could start a session by gnucash.gnucash_core_c.qof_session_begin(). But if you just try
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#
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# @code session=gnucash.gnucash_core_c.qof_session_begin() @endcode
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#
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# you will get an error message and realize the lack of convenience for you have to add the correct function parameters.
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#
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# Not all of the available structures will work. SWIG just takes everything from the sources that it is fed with and translates it. Not everything
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# is a working translation, because not everything has been worked through. At this point you are getting closer to the developers who you can
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# contact at the mailing-list gnucash-devel@gnucash.org. There may be a workaround. Maybe the problem can only be fixed by changing SWIGs input
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# files to correctly translate the c-source. Feel free to post a question at the developers list. It may awaken the interest of someone who creates
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# some more beautiful python-interfaces.
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#
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# @section Thisorthat When to use which api ?
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#
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# The start would surely be the high-level api for you can be quite sure to have something working and you will maybe find
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# explanations in the example-scripts. If you search for something that is not yet implemented in that way you will have to
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# take your way to the c-style-api.
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#
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# @section pydoc (Further) documentation
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#
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# @li The documentation you just read uses doxygen. It collects documentation in GnuCash's sources. Besides that there is
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# @li the classic python-documentation using help() and docstrings. Have a look at both.
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# @li There is a page in the GnuCash wiki at https://wiki.gnucash.org/wiki/Python
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# @li You may also have a look into the archives of gnucash-devel@gnucash.org.
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# @li On Bugzilla there is also some interesting talk regarding the development process.
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# @li Then you can use the abilities of git to see the history of the code by @code git log @endcode done in the directory of the python-bindings.
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#
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