class base():
def __init__(self):
self.var = 10
def add(self, num):
res = self.var+num
return res
class inherit(base):
def __init__(self, num=10):
x = super().add(num)
a = inherit()
print(a)
Hello,
I'm learning about inheritance and super(). When running this, the error AttributeError: 'inherit' object has no attribute 'var' is returned. How can I inherit the init variables too?
You first need to call super constructor because you did not define var in your base class constructor.
Working version of your code (though you should probably add var in base __init__)
class Base:
def __init__(self):
self.var = 10
def add(self, num):
res = self.var + num
return res
class Inherit(Base):
def __init__(self, num=10):
super().__init__()
x = super().add(num)
a = Inherit()
print(a)
class Base:
def __init__(self, var=10):
self.var = var
def add(self, num):
res = self.var + num
return res
class Inherit(Base):
pass
a = Inherit()
a.add(0) # replace 0 with any integer
object
object originally. That was introduced when class semantics changed from "old style" to "new style" classes, and was something of a dirty hack. Since python 3, all classes are "new style" classes and the dirty hack isn't needed. Its really only there for backwards compatibility. This is one of those cases where I don't think that explicit wins.open("whatever", "r") for instance subtly makes a reviewer think twice...
super()to initialize class instance, then access to instance variable.