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Step-by-step debugging with IPython
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ps: note that an ipdb command takes precedence over python code. So in order to write list(foo) you'd need print list(foo).
Also, if you like the ipython prompt (its emacs and vim modes, history, completions,…) it's easy to get the same for your project since it's based on the python prompt t...
How to query as GROUP BY in django?
... @Gidgidonihah True, the example should read Members.objects.order_by('disignation').values('designation').annotate(dcount=Count('designation'))
– bjunix
Oct 30 '14 at 15:16
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How do MySQL indexes work?
...index type is the B+Tree based index, that stores the elements in a sorted order. Also, you don't have to access the real table to get the indexed values, which makes your query return way faster.
The "problem" about this index type is that you have to query for the leftmost value to use the index....
Android: How can I get the current foreground activity (from a service)?
... the service call an event method on that callback/listener object
Send an ordered broadcast Intent to the activity, with a low-priority BroadcastReceiver as backup (to raise a Notification if the activity is not on-screen) -- here is a blog post with more on this pattern
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Single Line Nested For Loops
... the same as this nested for loop (and, as the tutorial says, note how the order of for and if are the same).
>>> combs = []
>>> for x in [1,2,3]:
... for y in [3,1,4]:
... if x != y:
... combs.append((x, y))
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>>> combs
[(1, 3), (1, 4), (2, 3), ...
Find kth smallest element in a binary search tree in Optimum way
...doing the operation in O(n), the worst case since I am planning to do an inorder traversal of the entire tree. But deep down I feel that I am not using the BST property here. Is my assumptive solution correct or is there a better one available ?
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Linq to Entities join vs groupjoin
... outer join in LINQ is a GroupJoin, flattened by SelectMany.
2. Preserving order
Suppose the list of parents is a bit longer. Some UI produces a list of selected parents as Id values in a fixed order. Let's use:
var ids = new[] { 3,7,2,4 };
Now the selected parents must be filtered from the parents...
IList vs IEnumerable for Collections on Entities
...th lists of things, should they be exposed as ILists or IEnumerables? E.g. Order has a bunch of OrderLines.
2 Answers
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How to get index using LINQ? [duplicate]
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An IEnumerable is not an ordered set.
Although most IEnumerables are ordered, some (such as Dictionary or HashSet) are not.
Therefore, LINQ does not have an IndexOf method.
However, you can write one yourself:
///<summary>Finds the index of ...
Callback when CSS3 transition finishes
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This is a borderline link-only answer. You should expand your answer to include as much information here, and use the link only for reference.
– Goodbye StackExchange
Oct 31 '18 at 22:33
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