I have the following simple methods for writing a python object to a file using jsonpickle:
def json_serialize(obj, filename, use_jsonpickle=True):
f = open(filename, 'w')
if use_jsonpickle:
import jsonpickle
json_obj = jsonpickle.encode(obj)
f.write(json_obj)
else:
simplejson.dump(obj, f)
f.close()
def json_load_file(filename, use_jsonpickle=True):
f = open(filename)
if use_jsonpickle:
import jsonpickle
json_str = f.read()
obj = jsonpickle.decode(json_str)
else:
obj = simplejson.load(f)
return obj
the problem is that whenever I use these, it loads my objects back as dictionaries (that have fields like: "py/object": "my_module.MyClassName") but not as an actual Python object of the type that was used to generate the json string. How can I make it so jsonpickle actually converts the loaded string back to the object?
to illustrate this with an example, consider the following:
class Foo:
def __init__(self, hello):
self.hello = hello
# make a Foo obj
obj = Foo("hello world")
obj_str = jsonpickle.encode(obj)
restored_obj = jsonpickle.decode(obj_str)
list_objects = [restored_obj]
# We now get a list with a dictionary, rather than
# a list containing a Foo object
print "list_objects: ", list_objects
This yields:
list_objects: [{'py/object': 'as_events.Foo', 'hello': 'hello world'}]
Rather than something like: [Foo()]. How can I fix this?
thanks.
The correct answer was that I was not inheriting from object. Without inheriting from object, jsonpickle cannot correctly decode classes that take one or more arguments in the constructor, it seems. I am by no means an expert but making it Foo(object): rather than Foo: in the class declaration fixed it.