"KraftDiner" <[EMAIL PROTECTED]> writes:
> I have a dictionary and sometime the lookup fails...
> it seems to raise an exception when this happens.
> What should I do to fix/catch this problem?
>
> desc = self.numericDict[k][2]
> KeyError: 589824 <---- This is the error that is being produced,
> because there is no key
> 589824.
Others have suggested the general solution of using 'try ... except
Foo' for catching a particular exception and dealing with it.
In the specific use case of wanting a default value when a dictionary
doesn't have a particular key, you can also use this:
>>> foo = {0: "spam", 1: "eggs", 7: "beans"}
>>> for key in [1, 2, 7]:
... desc = foo.get(key, None)
... print repr(desc)
...
'eggs'
None
'beans'
A brief description is at 'help(dict.get)'.
--
\ "The illiterate of the future will not be the person who cannot |
`\ read. It will be the person who does not know how to learn." |
_o__) -- Alvin Toffler |
Ben Finney
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