[Tutor] Checking if value exist in a '2D array'
kent37 at tds.net
Fri Jun 17 12:12:10 CEST 2005
Olli Rajala wrote:
> Hi again,
> I have a '2D array', I mean a list inside a list ([,,...]) and
> would need to check if the value exists in it. Of course I could do a
> for loop, but that just seem to be a little overkill, so is there any
> other way to do it? I have to check the first cell of every insider
With Python 2.4:
>>> l= [ , [2,3], [4,5], ]
>>> 2 in (i for i in l)
>>> 3 in (i for i in l)
with Python 2.3 use [i for i in l] instead which is a little less efficient.
> Here's a little pseudo code if that helps.
> if list[[x]] == 'value': # where x can be anything > 0
> print 'found'
> So, is there a similar method like list.count('value') that I use for 1D lists?
I would use 'value' in list rather than list.count('value') because it will stop when it finds 'value'; list.count() will always inspect the whole list.
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