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Calculate difference in keys contained in two Python dictionaries
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You can use set operations on the keys:
diff = set(dictb.keys()) - set(dicta.keys())
Here is a class to find all the possibilities: what was added, what was removed, which key-value pairs are the same, and which key-value pairs are ch...
Python Dictionary Comprehension
...(5)}
>>> print d
{0: 0, 1: 1, 2: 4, 3: 9, 4: 16}
If you want to set them all to True:
>>> d = {n: True for n in range(5)}
>>> print d
{0: True, 1: True, 2: True, 3: True, 4: True}
What you seem to be asking for is a way to set multiple keys at once on an existing dict...
How to determine the longest increasing subsequence using dynamic programming?
I have a set of integers. I want to find the longest increasing subsequence of that set using dynamic programming.
19 Ans...
Create an empty data.frame
I'm trying to initialize a data.frame without any rows. Basically, I want to specify the data types for each column and name them, but not have any rows created as a result.
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How to open, read, and write from serial port in C?
...om tcgetattr. You cannot zero-out a struct termios, configure it, and then set the tty with tcsetattr. If you use the zero-out method, then you will experience unexplained intermittent failures, especially on the BSDs and OS X. "Unexplained intermittent failures" include hanging in read(3).
#includ...
Making iTerm to translate 'meta-key' in the same way as in other OSes
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For my external keyboard I had to set both left and right option keys to use Esc+, even though I was using the left option key it would still print weird characters. This might happen because I use the Keyboard Modifiers option in Mac Keyboard settings to cha...
The following untracked working tree files would be overwritten by merge, but I don't care
...de. As well as deleting the unwanted directory I also just deleted my user settings for the project :-(
– dumbledad
Dec 11 '15 at 7:35
7
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Find Results not displaying Results
Today my Find Results feature of Visual Studio 2012 stopped working. The Find Results windows displays summary information, but not the actual lines matched. This is all my Find Results window displays:
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LINQ with groupby and count
This is pretty simple but I'm at a loss:
Given this type of data set:
3 Answers
3
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What guarantees are there on the run-time complexity (Big-O) of LINQ methods?
...on is O(1) instead of O(N).
Distinct, GroupBy Join, and I believe also the set-aggregation methods (Union, Intersect and Except) use hashing, so they should be close to O(N) instead of O(N²).
Contains checks for an ICollection implementation, so it may be O(1) if the underlying collection is also O...