[Zope] cut / change letters in a string in python

Hi, how do I cut all letters in a string? The string is "6.0b". Before using float ("6.0b") I'd like to change "b" to "02" or just cut all letters. Thanks and good night Marcus -- _____________________________________ (0> Marcus Schopen //\ P.O. Box 10 25 25 V_/_ 33525 Bielefeld, Germany ICQ#120991527 _____________________________________ Live as variously as possible