Question

I’m brand new to python, and need some help understanding this code fragment:

for c in [B, C, D]:
   try:
      raise c()
   except D:
      print "D"
    except C:
      print "C"
    except B:
      print "B"

Reading python docs, it seems raise() throws an exception, but I can’t figure out why raise() is within the try block. Shouldn’t it be something like this:

try:
    //do something
catch:
    raise()

Answer 1

raise is how you raise exceptions in the first place. A lone raise in an exception handler only propagates the exception to external handlers.