Python update object from dictionary

Question

Is there a built-in function/operator I could use to unpack values from a dictionary and assign it into instance variables?

This is what I intend to do:

c = MyClass() c.foo = 123 c.bar = 123  # c.foo == 123 and c.bar == 123   d = {'bar': 456} c.update(d)  # c.foo == 123 and c.bar == 456 

Something akin to dictionary update() which load values from another dictionary but for plain object/class instance?

Answer 1

there is also another way of doing it by looping through the items in d. this doesn't have the same assuption that they will get stored in c.__dict__ which isn't always true.

d = {'bar': 456} for key,value in d.items():     setattr(c,key,value) 

or you could write a update method as part of MyClass so that c.update(d) works like you expected it to.

def update(self,newdata):     for key,value in newdata.items():         setattr(self,key,value) 

check out the help for setattr

setattr(...)     setattr(object, name, value)     Set a named attribute on an object; setattr(x, 'y', v) is equivalent to     ''x.y = v''.