```
class Triangle(object):
def __init__(self, angle1, angle2, angle3):
self.angle1=angle1
self.angle3=angle3
self.angle2=angle2
number_of_sides='3'
def check_angles(self):
if self.angle1+self.angle2+self.angle3==180:
return True
else:
return False
my_triangle=Triangle(90,60,30)
print my_triangle.check_angles()
print my_triangle.number_of_sides
```

I wrote this code in Classes section. I was wondering why we did not put brackets[ie."()"] after

```
print my_triangle.number_of_sides
```

as we did after

```
print my_triangle.check_angles()
```