I am using a C++ SDK where there is a function like (it has a python wrapper, but not docs):

```
getPos ( int uvId, float & u, float & v ) const 

```

How do I specify in Python so that the passed variables are changed?

I tried this example to see if I could modify floats inside a function, but it didn't work, so printed 12.0:

```
def change ( a ) :

    a = 35.0

b = 12.0

change ( b )

print b

```

So how do I call this function that I can change 2 external floats in Python?

Related:

* [Python: variable scope and function calls](https://stackoverflow.com/questions/575196/python-variable-scope-and-function-calls/)