Another form of dynamic import

[Terry Reedy]

Marco Nawijn wrote:

> In short I would like to know if somebody knows if it is possible to
> re-execute a statement that raised an exception? 

In short, no.

> 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

Either make sure names are defined before you use them (easy) or provide 
  alternative code in the except clause.

If you actually have the name written literally in the code, you should 
simply import it first, so I presume you have a more complicated use 
case where the name to use is dynamically defined in a string.  If so, 
do something like

aPoint = MyImporter(class_name)(1.0, 0.0, 0.0)

where MyImporter.__new__ imports and returns the class

Terry Jan Reedy