I want to define a dictionary inside a function. How I can define that dictionary only one time and on the function creation time. I'm trying to prevent dictionary creation on each function call.
currently I define a global dictionary and use that inside the function, but is there another solution?

```
media_types = {
    1: 'New Video',
    2: 'New Image',
    3: 'New File',
}

def get_media_type(t):
    return media_types.get(t, None)

```