Difference between revisions of "Python shell"
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Revision as of 14:22, 22 January 2021
The python shell provides a gtk window with a python shell. The shell is based on the work of Nicolas Rougier from 2008. There have been some changes to python and ipython api since then that have not yet been fully integrated.
Contents
Installation and Activation
Installation
Python shell comes with the python bindings. Install those.
Activation
The source of the file init.py needs to modified. When compiling gnucash from source it can be done beforehand. If installing from packages the installed file needs to be changed. It may be at different places depending on your distribution / the way it has been installed - something like "local/share/gnucash/python/init.py". "which gnucash" to locate the gnucash binary may be a start to look for it. Enabling extra debug output will output the location of the file.
init.py# Change this to "if True:" to switch on a python console at gnucash
# startup:
# shelltype can either be "python" or "ipython" (the latter is not yet fully functional)
if False:
if True:
extra debug output
The python module will print out some additional information when gnucash is started with extra debug output:gnucash --debug --extra
(see Tracefile#Trace_File_Adjustments)
One important information here is the location of the file.
Location
In the source tree the shell is at gnucash/python (while the python bindings are at bindings/python).
Configuration
The shell provides a python and an ipython interface. Just now only the python shell is working. Ipython had some major API-changes in Version 5.
Usage examples
The Python Bindings can be accessed using the gnucash module:import gnucash
from gnucash import _sw_app_utils
session_instance = _sw_app_utils.gnc_get_current_session()
# the next line doesn't work at the moment as Session wrapper has no instance argument (requested in https://github.com/Gnucash/gnucash/pull/678)
# session = gnucash.Session(instance=session_instance)
book_instance = _sw_app_utils.gnc_get_current_book()
book = gnucash.Book(instance = book_instance)
root_account_instance = _sw_app_utils.gnc_get_current_root_account()
root_account = gnucash.Account(instance = root_account_instance)
To get more information have a look at group python bindings examples and in Python Bindings.
Warning
Be careful - if you use the python bindings in the shell to work on gnucash financial data: gnucash is not designed to have multiple instances changing the data at the same time, reading should be secure.
Background
The shell is based on the work of Nicolas Rougier from 2008. IPython api has changed a lot since then. The changes have not been reflected in gnucash python shell.
Links
Looking for other projects including (i)python shells for possible fixes of ipython shell:
- https://stackoverflow.com/questions/16639199/embedding-an-ipython-shell-in-a-gtk-program#48054041
- https://gitlab.gnome.org/GNOME/accerciser/-/blob/master/plugins/ipython_view.py
- http://code.ascend4.org/ascend/trunk/pygtk/ipython_view.py?view=markup
- https://github.com/ipython/ipython/wiki/Trash:-Old-Embedding-GTK
- https://dev.gajim.org/gajim/gajim/commit/c3eba4037e902280436fe5afd8df22e1289e1f33
