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Is a Python dictionary an example of a hash table?
... structures in Python is the dictionary, which allows one to record "keys" for looking up "values" of any type. Is this implemented internally as a hash table? If not, what is it?
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Regex exactly n OR m times
...y is the ?: needed in the if m = 2n example? Seems to work fine without it for me.
– erb
Jun 18 '15 at 8:42
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How do you get the footer to stay at the bottom of a Web page?
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To get a sticky footer:
Have a <div> with class="wrapper" for your content.
Right before the closing </div> of the wrapper place the
<div class="push"></div>.
Right after the closing </div> of the wrapper place the
<div class="footer"></div>.
*...
Refresh image with a new one at the same url
...y when you are creating the image, and it will make the browser look again for the image instead of retrieving the one in the cache.
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Notification click: activity already open
...re previously displayed on top. This certainly is not an expected behavior for a user putting the app in background while in a different activity and reopening it.
– German
May 5 '14 at 19:28
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Which commit has this blob?
... and sweet, but slow:
#!/bin/sh
obj_name="$1"
shift
git log "$@" --pretty=format:'%T %h %s' \
| while read tree commit subject ; do
if git ls-tree -r $tree | grep -q "$obj_name" ; then
echo $commit "$subject"
fi
done
And an optimised version in Perl, still quite short but much fas...
Find MongoDB records where array field is not empty
... that index is utilized during the query, you will get unexpected results. For example: db.doc.find({'nums': { $gt: [] }}).hint({ _id: 1 }).count() returns the right number, while db.doc.find({'nums': { $gt: [] }}).hint({ nums: 1 }).count() returns 0.
– wojcikstefan
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What is the difference between Unidirectional and Bidirectional JPA and Hibernate associations?
... directions.
Note that navigational access is not always good, especially for "one-to-very-many" and "many-to-very-many" relationships. Imagine a Group that contains thousands of Users:
How would you access them? With so many Users, you usually need to apply some filtering and/or pagination, so t...
Is there an equivalent to CTRL+C in IPython Notebook in Firefox to break cells that are running?
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Unfortunately it seems that the browser can become so unresponsive, that it is hard to reach the server page.
– K.-Michael Aye
Dec 15 '14 at 1:56
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How to delete images from a private docker registry?
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Currently you cannot use the Registry API for that task. It only allows you to delete a repository or a specific tag.
In general, deleting a repository means, that all the tags associated to this repo are deleted.
Deleting a tag means, that the association between ...