ExceptionsThe try statementtry: f = open("foo") except IOError: print "Couldn't open 'foo'. Sorry." The raise statementdef factorial(n): if n < 0: raise ValueError,"Expected non-negative number" if (n <= 1): return 1 else: return n*factorial(n-1) Uncaught exception>>> factorial(-1) Traceback (innermost last): File "<stdin>", line 1, in ? File "<stdin>", line 3, in factorial ValueError: Expected non-negative number >>> |
<<< | O'Reilly OSCON 2000, Advanced Python Programming, Slide 17 July 17, 2000, beazley@cs.uchicago.edu |
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