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2008-08-03T15:47:22.100
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I think: <pre><code>#!/bin/python bar in dict(Foo) </code></pre> Is what you are thinking of. When trying to see if a certain key exists within a dictionary in python (python's version of a hash table) there are two ways to check. First is the <code>has_key()</code> method attached to the dictionary and second is the example given above. It will return a boolean value. That should answer your question. And now a little off topic to tie this in to the list comprehension answer previously given (for a bit more clarity). List Comprehensions construct a list from a basic for loop with modifiers. As an example (to clarify slightly), a way to use the <code>in dict</code> language construct in a list comprehension: Say you have a two dimensional dictionary <code>foo</code> and you only want the second dimension dictionaries which contain the key <code>bar</code>. A relatively straightforward way to do so would be to use a list comprehension with a conditional as follows: <pre><code>#!/bin/python baz = dict([(key, value) for key, value in foo if bar in value]) </code></pre> Note the <code>if bar in value</code> at the end of the statement**, this is a modifying clause which tells the list comprehension to only keep those key-value pairs which meet the conditional.** In this case <code>baz</code> is a new dictionary which contains only the dictionaries from foo which contain bar (Hopefully I didn't miss anything in that code example... you may have to take a look at the list comprehension documentation found in <a href="http://docs.python.org/tut/node7.html#SECTION007140000000000000000" rel="nofollow noreferrer">docs.python.org tutorials</a> and at <a href="http://www.secnetix.de/olli/Python/list_comprehensions.hawk" rel="nofollow noreferrer">secnetix.de</a>, both sites are good references if you have questions in the future.).
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