### Question :

I recently start teaching myself game programming. Someone recommend me to start with Python and I got the book “Beginning game development with Python and Pygame: From novice to professional”. I got to a part where they teach about Vectors and creating a Vector2 class. Everything was going well until I tried to overload the division operator.

My code goes like this:

```
class Vector2(object):
def __init__(self, x=0.0, y=0.0):
self.x = x
self.y = y
def __str__(self):
return "(%s, %s)"%(self.x, self.y)
@classmethod
def from_points(cls, P1, P2):
return cls(P2[0] - P1[0], P2[1] - P1[1])
def __add__(self,rhs):
return Vector2(self.x + rhs.x, self.y + rhs.y)
def __sub__(self,rhs):
return Vector2(self.x - rhs.x, self.y - rhs.y)
def __mul__(self, scalar):
return Vector2( self.x*scalar, self.y*scalar)
def __div__(self, scalar):
return Vector2( self.x/scalar, self.y/scalar)
```

Now, when I tried to call the “/” operator, this shows up:

```
AB = Vector2(10.0,25.0)
print(AB) # <<<<(10.0, 25.0)
v1 = AB + Vector2(20.,10.)
print(v1) # <<<<(30.0, 35.0)
v2 = AB - Vector2(20.,10.)
print(v2) # <<<<(-10.0, 15.0)
v3 = AB * 3
print(v3) # <<<<(30.0, 75.0)
print(v3 / 3)
TypeError: unsupported operand type(s) for /: 'Vector2' and 'int'
```

This was all in Python 3.3 but if I run it with Python 2.7, everything works correctly.

Where’s the problem?

##
Answer #1:

In Python 3.x, you need to overload the `__floordiv__`

and `__truediv__`

operators, not the `__div__`

operator. The former corresponds to the `//`

operation (returns an integer) and the latter to `/`

(returns a float).

##
Answer #2:

In Python 3, the division operators are called `__truediv__`

and `__floordiv__`

. See the Data model documentation for more information.