On 25 Mrz., 15:23, Marco Nawijn <naw...@gmail.com> wrote: > Hello, > > In short I would like to know if somebody knows if it is possible to > re-execute a statement that raised an exception? I will explain the > reason by providing a small introduction on why this might be nice in > my case > and some example code. > > I am using the python bindings to a *very* large C++ library. About > 5000 classes divided over approx. 450 different > packages are exposed through the Python interface. To reduce the > number of import statements that need to be inserted and to limit the > number of wildcard imports it would be very helpful if class names > could be automatically imported from the proper module. There is no > problem in finding out the proper module given a (valid) class name. > > As an example, look at the following statement > > >> aPoint = gp_Pnt(1.0, 0.0, 0.0) # Oops, this will raise a NameError, > >> since > > # gp_Pnt class > is unknown > > NameError: name 'gp_Pnt' is not defined > > As indicated, this will raise a NameError exception. What I would like > to do is something like the following (pseudo-code): > > try: > .... > .... > aPoint = gp_Pnt(1.0, 0.0, 0.0) [1] > > .... > .... > except NameError, e: > > name = e.args[0].split[1] > > if isValid(name): > doImport(name) > ===> Can I go back to statement [1] from this point? > else: > raise e > > There is no problem in catching the exception, finding out which name > is unknown to python and check if this is a valid name for my library. > My question is, is there any possibility of going back to the > statement that raised the error, re-execute the statement and > continue? > > Thanks for any thoughts and suggestions. > > Marco
There is no call/cc continuation in Python when you are asking for such a thing. I wonder however why you don't try lazy attribute access? Instead of making a raw function call like that to gp_Pnt, one can thread all calls to the C++ system through an object that implements __getattr__ and loads new names incrementally if one is missing. -- http://mail.python.org/mailman/listinfo/python-list
