[Python-Dev] (try-except) conditional expression similar to (if-else) conditional (PEP 308)

[MRAB]

Dino Viehland wrote:
> On option 1 is this legal then?
> 
> x = float(string) except float('nan') if some_check() else float('inf') if ValueError
> 
Well, is this is legal?

     try:
         x = float(string)
     except some_check():
         x = float('nan')
     except ValueError:
         x = float('inf')

In other words, some_check() returns an exception _class_.

 >>> def get_exception():
     return ValueError

 >>> try:
     x = float("")
except get_exception():
     print "not a float"


not a float