[Zope] How to test if an object exist

Hi, In the following code I test if a folder exists. The folder name to test is generated on the fly and here I try to simultate it with 'exce' function (may my error). The first time object2create does not exist and object2create is well created but if run again the script I obtain the following error : Errot Type: NameError Error Value: folder1 How to manage this problem ? FR. ===== CODE ===== def testFolder(self): self=self.this() sub1=self.folder1 exec "object2create = 'folder11'" try: if sub1.object2create: return 'Object exists' except AttributeError: sub1.manage_addFolder(object2create) return 'Object created'