General query regarding conversion of dict to class object

[saisankalpj]

i have a object of type class<'postdata'>
This object contains details of a person
Now to convert this object to string.I have tried

json.dumps(object)

But this gives error like

object of type "postdata" is not json serializable

So i have tried

json.loads(json.dumps(object,default=lambda x: x.__dict__))

The output to above statement is dictionary
How to display this in initial format on console.I want type of output to be again

class<'postdata'>

Second question is
i have function

def abc():
   print("call in function abc")

so instead of writing "call in function abc",the function name should be taken dynamically,like what ever is function name ,it should print like calling that function,without us specifying abc