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###### Kurobe Kuro^T_T^

5,369 Points# Challenge Task 2 of 2 Now wrap it up by adding in __imul__, which does in-place multiplication. Be sure to update self.

i really dot get it

```
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):
if "." in self.value:
return float(self) * other
return int(self) * other
def __rmul__(self, other):
return self * other
def __imul__(self, other):
self.value = self.value * other
return self.value
```

## 1 Answer

###### Chris Freeman

Treehouse Moderator 68,082 PointsYou are close to having the correct answer. The goal of `__imul__`

is to retain the object type of `self.value`

as a `str`

.

Let's break down what you've tried:

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

Since `self.value`

is a string, multiplying it by a integer will result in a repeated string, not a new string containing the updated number. With the `__mul__`

method is available, use it to do the multiplication. To trigger the use of `__mul__`

, use `self`

as the *multiplicand* in place of `self.value`

. This gives us:

```
self.value = self * other
```

One drawback is `__mul__`

returns an *integer* instead of *string*. To fix this, wrap the multiplication with `str()`

:

```
self.value = str(self * other)
```

Post back if you need more help. Good luck!!

## Kurobe Kuro^T_T^

5,369 Points## Kurobe Kuro^T_T^

5,369 Pointsthank you id figure it out :D