On 2010年9月11日 10:17:21 +1200, Lawrence D'Oliveiro wrote: > In message <mailman.567.1283927599.29448.python-list at python.org>, Ian > Kelly wrote: >>> And returning None on failure is dangerous, because if the programmer >> does not take care to handle that case, the program may attempt to >> regard it as actual data. >> But None *is* actual data. Of course it is. Which makes it hard to distinguish None used as data from None used as a signal for an exceptional case. -- Steven