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How to get duplicate items from a list using LINQ? [duplicate]
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240
var duplicates = lst.GroupBy(s => s)
.SelectMany(grp => grp.Skip(1));
Note that th...
How do I check the difference, in seconds, between two dates?
...ates, use total_seconds like this:
import datetime as dt
a = dt.datetime(2013,12,30,23,59,59)
b = dt.datetime(2013,12,31,23,59,59)
(b-a).total_seconds()
86400.0
#note that seconds doesn't give you what you want:
(b-a).seconds
0
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Why is reading lines from stdin much slower in C++ than Python?
...ed together. For example:
int myvalue1;
cin >> myvalue1;
int myvalue2;
scanf("%d",&myvalue2);
If more input was read by cin than it actually needed, then the second integer value wouldn't be available for the scanf function, which has its own independent buffer. This would lead to unexp...
How to get instance variables in Python?
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answered Sep 20 '08 at 19:34
cnucnu
30.7k2121 gold badges6161 silver badges6363 bronze badges
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Resource interpreted as stylesheet but transferred with MIME type text/html (seems not related with
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Is there a reason that Swift array assignment is inconsistent (neither a reference nor a deep copy)?
...), so the question no longer applies. The following answer applied to beta 2:
It's for performance reasons. Basically, they try to avoid copying arrays as long as they can (and claim "C-like performance"). To quote the language book:
For arrays, copying only takes place when you perform an ac...
Ruby Metaprogramming: dynamic instance variable names
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edited Feb 6 '13 at 4:22
amacy
28066 silver badges1414 bronze badges
answered Jul 19 '11 at 2:21
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Entity Framework - Invalid Column Name '*_ID"
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answered Dec 18 '13 at 8:23
drewiddrewid
2,31522 gold badges1313 silver badges99 bronze badges
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Install Gem from Github Branch?
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201
You don't need to build the gem locally. In your gemfile you can specify a github source with ...
How can I tell when a MySQL table was last updated?
...ter of my page, I would like to add something like "last updated the xx/xx/200x" with this date being the last time a certain mySQL table has been updated.
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