jm*******@no.spam.gmail.com wrote:
Hi,
Is there any standard text format for storing data of object oriented
nature.
The text file should be readable.
That is, Is there any better way than having to write out a file like
this from the original place and read it in python and process it.
#----------------------------
world = World(name='MyWorld')
world.objects.append(Box(color='red'))
world.objects.append(Circle(color='green'))
world.someProp = "123"
#-----------------------------
Thanks.
Suresh
While it is a little hard to determine your exact use case, I'll
try. I have an application that dynamically creates objects from
..INI configuration file. I use ConfigParser to process it. The
entries are something like the following:
[world_MyWorld]
object_001=Box(color='red')
object_002=Circle(color='green')
property_someProp=123
property_someOtherProp=XYZ
I then read using ConfigParser and use list comprehensions to isolate
what I'm looking for in the file. Code not tested, but should serve as
and example and I think you will get the idea. Note: Please don't get
too caught up in "premature optimization". I use this to process .INI
files with thousands of lines and it goes through the process in fractions
of a second.
-Larry
Sample Code (written completely from my memory):
INI=ConfigParser.ConfigParser()
INI.read(inifilepath)
#
# Get a list of the world sections in the .INI file
#
world_sections=[section for section in INI.sections()
if section.beginswith('world')
..
.. Get lists of any other objects/sections here
..
#
# Create a list to store your instances of world_objects
#
world_instances=[]
#
# Loop over all the sections in the .INI file that create world objects
#
for section in world_sections:
#
# Isolate the name of this world object
#
name=section.split('_')[1]
obj=World(name=name)
#
# Create a list to store world instance objects here
#
world_objects=[object for object in INI.options(section)
if object.startswith('object')]
#
# Loop over all the instance objects defined and append them here
#
for object in world_objects:
#
# Use eval to create object then append it. Note: eval is
# dangerous if you don't control the .INI file. Untrusted .INI
# file could have eval doing BAD things.
#
obj.append(eval(object))
#
# Create a list to store world instance properties here
#
world_properties=[object for object in INI.options(section)
if object.startswith('property')]
#
# Loop over all the instance objects defined and append them here
#
for property in world_properties:
value=INI.get(section, property)
property_name=property.split('_')[1]
#
# Use setattr to set the property
#
setattr(obj, property_name, value)
#
# Append this world object onto the list
#
world_instances.append(obj)
