My code:
class Potato:
def __init__(self, r):
self.size = r
def __itruediv__(self, other):
self.size /= other
return Potato(self.size)
def __truediv__(self, other):
a = self.size
self.size -= self.size / other
return Potato(a / other)
def __str__(self):
return f"Potato({self.size})"
pt = pt1 = Potato(7)
pt /= 4
print(pt)
pt2 = pt / 3
print(pt, pt1, pt2, sep='\n')
Output:
Potato(1.75)
Potato(1.1666666666666665)
Potato(1.75)
Potato(0.5833333333333334)
Need Output:
Potato(1.75)
Potato(1.1666666666666665)
Potato(1.1666666666666665)
Potato(0.5833333333333334)
I don't know, why pt1 don't have same output as pt? and how to solve it. Please help
The in-place operators should normally return the object that was modified. The return value is assigned to the variable, so if it returns a new object the variable will be reassigned. Because of this, after
pt /= 4
pt and pt1 no longer refer to the same Potato instance.
Conversely, the regular arithmetic operators should not normally modify their arguments, they should just return a new object. So __truediv__() should not reassign self.size.
class Potato:
def __init__(self, r):
self.size = r
def __itruediv__(self, other):
self.size /= other
return self
def __truediv__(self, other):
a = self.size / other
return Potato(a)
def __str__(self):
return f"Potato({self.size})"
pt = pt1 = Potato(7)
pt /= 4
print(pt)
pt2 = pt / 3
print(pt, pt1, pt2, sep='\n')