[Tutor] creating a sound file from a string

[Norman Khine]

hello,
i have a string that is generated that contains letters and numbers.

i also have a folder which contains the following:

sounds/
upper-a.wav
upper-b.wav
..
lower-a.wav
lower-b.wav
...
sign-£.wav
sign-|.wav
..
number-0.wav
number-1.wav
..

does anyone know of a python module which would create a single sound 
file based on the randomly generated string?

i have looked at the python wave module, but if i am not wrong this 
works with one file at the time.


any advise much appreciated.

many thanks

norman