Hi I want to define an object value as a sum of values of two objects of the same class before I know what the value of those 2 objects is. I need to do something like:
`A=: B+C
B=10
C=20
print A`
I have a class Set and I'm trying something like:
class Set(object):
def __init__(self, w):
self.value=w
a=Set
c=a
a(10)
print c
But c is still class instead of object instance. Can somebody help me?
a is a class Set and so is c. a(10) generates an instance but discards it right away. You need to create instances and assign values later. Something like that:
class Sum(object):
def __init__(self, *values):
self.values = values
@property
def value(self):
return sum(v.value for v in self.values)
class Value(object):
def __init__(self, value=0):
self.value=value
b = Value()
c = Value()
a = Sum(b,c)
b.value = 10
c.value = 20
print a.value
One way is to leverage dict of object. You can use __dict__ function of class.
class First:
a = "A"
b = "B"
c = "C"
class Second:
a = None
b = None
c = None
d = "D"
def __init__(self, **kwargs):
self.__dict__.update(kwargs)
Now you can initialize Second class, using First class instance as follows:
first = First()
second = Second(**(first.__dict__))
print(second.a)
