call of non-function (type string) error

[Paul Prescod]

Graham Guttocks wrote:
> 
> ...
> >>> CIPHER = "DES3"
> >>> import Crypto.Cipher
> >>> cipher = getattr(Crypto.Cipher, CIPHER)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
> AttributeError: DES3

As Andrew pointed out this is an annoying corner case where you probably
do have to use exec. I'm not really thrilled with all of these corner
cases in Python's package handling. 

On the other hand, once you have the module object you can use getattr
to get the "new" function out of the module. 

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