python class attribute
- by chnet
Hi, i have a question about class attribute in python.
class base :
def __init__ (self):
pass
derived_val = 1
t1 = base()
t2 = base ()
t2.derived_val +=1
t2.__class__.derived_val +=2
print t2.derived_val # its value is 2
print t2.__class__.derived_val # its value is 3
The results are different. I also use id() function to find t2.derived_val and t2.class.derived_val have different memory address.
My problem is derived_val is class attribute. Why it is different in above example?
Is it because the instance of class copy its own derived_val beside the class attribute?
