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Best way to merge two maps and sum the values of same key?
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The shortest answer I know of that uses only the standard library is
map1 ++ map2.map{ case (k,v) => k -> (v + map1.getOrElse(k,0)) }
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In a PHP project, what patterns exist to store, access and organize helper objects? [closed]
...d. Note that such solutions also use difficult to test static methods.
I know a lot of people do it, approve it and use it. But reading Misko Heverys blog articles (a google testability expert), rereading it and slowly digesting what he says did alter the way I see design a lot.
If you want to be ...
How do I log a Python error with debug information?
...pplication does logging some other way – not using the logging module?
Now, traceback could be used here.
import traceback
def log_traceback(ex, ex_traceback=None):
if ex_traceback is None:
ex_traceback = ex.__traceback__
tb_lines = [ line.rstrip('\n') for line in
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How can I use “sizeof” in a preprocessor macro?
...rns out - as the article even says - I am building Linux kernel code right now - and there is a define already in the kernel - BUILD_BUG_ON - where the kernel uses it for things like: BUILD_BUG_ON(sizeof(char) != 8)
– Brad
Nov 2 '10 at 16:30
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Shards and replicas in Elasticsearch
...tand it. If I download Elasticsearch and run the script, then from what I know I have started a cluster with a single node. Now this node (my PC) have 5 shards (?) and some replicas (?).
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Why do people put code like “throw 1; ” and “for(;;);” in front of json responses? [du
...Chrome (5) are still vulnerable to this.
Another attack that all browsers now disallow was to redefine constructor functions:
Array= function() {
alert('I steal '+this);
};
[1, 2, 3]
And for now, IE8's implementation of properties (based on the ECMAScript Fifth Edition standard and Object.d...
Creating a ZIP Archive in Memory Using System.IO.Compression
... zipping without writing any file.
string fileName = "export_" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".xlsx";
byte[] fileBytes = here is your file in bytes
byte[] compressedBytes;
string fileNameZip = "Export_" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".zip";
using (var outStream = new Me...
What does |= (ior) do in Python?
...search |= so I'm having trouble finding relevant documentation. Anybody know?
8 Answers
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Importing modules from parent folder
...ttribute is not always given. Instead of using os.path.abspath(__file__) I now suggested using the inspect module to retrieve the filename (and path) of the current file
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Java: Calling a super method which calls an overridden method
... super doesn't change the instance. It doesn't set some hidden field "from now on, all method calls should start using SuperClass". Or to put it another way: The value of this doesn't change.
– Aaron Digulla
Oct 2 '14 at 11:36
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