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Tue Apr 10 20:49:41 EDT 2001 · http://mail.python.org/pipermail/python-list/2001-April/082305.html

Graham Guttocks wrote:
> 
> Greetings,
> 
> Any suggestions on how to get around this problem?  I'm trying to call
> a function using variables, but it obviously doesn't work that way.
> 
> -----------------------------------------------
> 
> CIPHER = "DES3"
> exec "from Crypto.Cipher import %s" % CIPHER
> 
> # cipherobj = DES3.new(KEY, DES3.CBC, IV)
> cipherobj = CIPHER + 'new'(KEY,CIPHER + '.CBC',IV)

Strings and exec are hardly ever necessary. They should be buried deep
in a module somewhere. Use getattr instead:

What you want is

CIPHER = "DES"
import Crypto.Cipher

cipher = getattr(Cyrpto.Cipher, CIPHER)
cipherobj = cipher.new(KEY, CIPHER+".CBC", IV)

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call of non-function (type string) error