[Zope] object of type 'string' is not callable

[drew nichols]

"object of type 'string' is not callable"

what does this error really mean



class myClass ( simpleItem ):

def  stringify( self ):
    str = "\nLogins: " + str( ['ello']  )



the actual method calls another method that returns a list (i have put a 
dummy list and still this error happens)



Thanks