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Find object in list that has attribute equal to some value (that meets any condition)
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next((x for x in test_list if x.value == value), None)
This gets the first item from the list that matches the condition, and returns None if no item matches. It's my preferred single-expression form.
However,
for x in test_list:
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std::vector performance regression when enabling C++11
I have found an interesting performance regression in a small C++ snippet, when I enable C++11:
1 Answer
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How do you remove a specific revision in the git history?
...y used this squash technique, but have never needed to remove a revision before. The git-rebase documentation under "Splitting commits" should hopefully give you enough of an idea to figure it out. (Or someone else might know).
From the git documentation:
Start it with the oldest commit you want ...
Randomize a List
... in a list I would like to assign a random order to, in order to draw them for a lottery type application.
23 Answers
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How to programmatically send a 404 response with Express/Node?
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Nowadays there's a dedicated status function for this on the response object. Just chain it in somewhere before you call send.
res.status(404) // HTTP status 404: NotFound
.send('Not found');
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Analytics Google API Error 403: “User does not have any Google Analytics Account”
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I had this problem too. I fixed it by adding the email address for my service account to the Google Analytics profile I wanted it to access.
I got the email address (something like xxxxxx@developer.gserviceaccount.com) for the service account by looking under the "API Access" tab in the ...
Generating v5 UUID. What is name and namespace?
...ead the man page, but I do not undestand what name and namespace are for.
3 Answers
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how to calculate binary search complexity
...cal way of seeing it, though not really complicated. IMO much clearer as informal ones:
The question is, how many times can you divide N by 2 until you have 1? This is essentially saying, do a binary search (half the elements) until you found it. In a formula this would be this:
1 = N / 2x
mu...
jQuery validate: How to add a rule for regular expression validation?
...o use jQuery instead of the ASP.NET validators. I am missing a replacement for the regular expression validator. I want to be able to do something like this:
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How can I tell when a MySQL table was last updated?
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In later versions of MySQL you can use the information_schema database to tell you when another table was updated:
SELECT UPDATE_TIME
FROM information_schema.tables
WHERE TABLE_SCHEMA = 'dbname'
AND TABLE_NAME = 'tabname'
This does of course mean opening a conn...