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What does the question mark in Java generics' type parameter mean?
...4.
Update: PDF link was updated since Oracle removed it a while back. It now points to the copy hosted by the Queen Mary University of London's School of Electronic Engineering and Computer Science.
Update 2: Lets go into a bit more detail as to why you'd want to use wildcards.
If you declare a ...
How to merge dictionaries of dictionaries?
...appropriate here.
d3 = d1.copy()
d3.update(d2)
return d3
And now
from functools import reduce
reduce(rec_merge, (d1, d2, d3, d4))
returns
{'a': {1: 'quux', 2: 'bar'}, 'b': {3: 'baz'}}
Application to the original question:
I've had to remove the curly braces around the letters an...
Can someone explain in simple terms to me what a directed acyclic graph is?
...uried in complex terminology (if we're asking this question, we might not know graph theory... or even need to know). My variant would be something like "bar-hopping where you can never go to the same bar twice". Although the family-tree example from another answer is probably conceptually simpler...
Force “git push” to overwrite remote files
...em up-to-date with the main development branch. Just let other developers know this will happen periodically so they'll know what to expect.
Update 2: Because of the increasing number of viewers I'd like to add some additional information on what to do when your upstream does experience a force pus...
FTP/SFTP access to an Amazon S3 Bucket [closed]
...
Update
S3 now offers a fully-managed SFTP Gateway Service for S3 that integrates with IAM and can be administered using aws-cli.
There are theoretical and practical reasons why this isn't a perfect solution, but it does work...
You ca...
How do I interactively unstage a particular hunk in git?
...
I should mention the more recent graphical Git clients now -- GitKraken is beautiful, and supports this (though it now comes with a hefty fee for commercial use). GitHub's GitHub Desktop is free, beautiful, and supports easily staging and unstaging hunks. GitKraken and GitHub Des...
SVN (Subversion) Problem “File is scheduled for addition, but is missing” - Using Versions
...svn, "look, I added some files via my OS's default file manager, and right now, the stuff in this folder, is what I want the current state of this repo to be... now let it happen... don't tell me what I can and can't do with these files, but yes, keep track of it all for me."?
–...
unresolved reference to object [INFORMATION_SCHEMA].[TABLES]
...d reference it via .\SharedSchemas\master.dacpac. That's probably resolved now, but was an issue in the first release.
– Peter Schott
Aug 7 '13 at 22:26
...
How to generate string of a certain length to insert into a file to meet a file size criteria?
...application written in C# which will automatically generate the files. I know the size of each file, ex. 100KB, and how many files to generate. What I need help with is how to generate a string less than or equal to the required file size.
...
jQuery equivalent of JavaScript's addEventListener method
...
As of jQuery 1.7, .on() is now the preferred method of binding events, rather than .bind():
From http://api.jquery.com/bind/:
As of jQuery 1.7, the .on() method is the preferred method for
attaching event handlers to a document. For earlier vers...