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# Why sometimes it uses self.value and other uses, self * other. Didn't get this part.

def iadd(self, other): self.value = self + other return self.value

```def __mul__(self, other):
return self * other

def __rmul__(self, other):
self.value = self * other
return self.value
```
numstring.py
```class NumString:
def __init__(self, value):
self.value = str(value)

def __str__(self):
return self.value

def __int__(self):
return int(self.value)

def __float__(self):
return float(self.value)

def __add__(self, other):
if '.' in self.value:
return float(self) + other
return int(self) + other

def __radd__(self, other):
return self + other

def __iadd__(self, other):
self.value = self + other
return self.value

def __mul__(self,other):
return self * other

def __rmul__(self,other):
self.value = self * other
return self.value
```

## 1 Answer

Using "`self.value`" gives direct access to the value stored in the instance. Using just "`self`" causes another of the "magic" methods to be invoked to handle the operation.