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Fri Aug 7 01:33:49 CEST 2009 · http://mail.python.org/pipermail/python-dev/2009-August/091071.html

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

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Showing content from http://mail.python.org/pipermail/python-dev/2009-August/091071.html below:

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