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Naming returned columns in Pandas aggregate function? [duplicate]

...er, this does not work with lambda functions, since they are anonymous and all return <lambda>, which causes a name collision: >>> df.groupby('A').agg({'B': [lambda x: x.min(), lambda x: x.max]}) SpecificationError: Function names must be unique, found multiple named <lambda> ...
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PHP array_filter with arguments

... As an alternative to @Charles's solution using closures, you can actually find an example in the comments on the documentation page. The idea is that you create an object with the desired state ($num) and the callback method (taking $i as an argument): class LowerThanFilter { private ...
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How can I use UUIDs in SQLAlchemy?

... dialect supports UUID columns. This is easy (and the question is specifically postgres) -- I don't understand why the other answers are all so complicated. Here is an example: from sqlalchemy.dialects.postgresql import UUID from flask_sqlalchemy import SQLAlchemy import uuid db = SQLAlchemy() ...
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Is it possible to create static classes in PHP (like in C#)?

... You can have static classes in PHP but they don't call the constructor automatically (if you try and call self::__construct() you'll get an error). Therefore you'd have to create an initialize() function and call it in each method: <?php class Hello { private static...
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How do I check if a number evaluates to infinity?

...ine but it won't be so obvious to maintainers of your code what you're actually trying to test for. I agree that using isFinite is almost always the better way to do things -- that's why I mentioned it in my answer -- but only the OP can decide whether it meets their requirements. ...
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Why is it string.join(list) instead of list.join(string)?

... I do not agree conceptually even if It makes sense codewise. list.join(string) appears more an object-oriented approach whereas string.join(list) sounds much more procedural to me. – Eduardo Pignatelli Jan 14 ...
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The required anti-forgery form field “__RequestVerificationToken” is not present Error in user Regis

...rs typing http were getting this error, putting in a rewrite rule to force all to https://{HTTP_HOST}/{R:1} fixed it – user1069816 Mar 24 '16 at 15:30 ...
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How to use the TextWatcher class in Android?

...ich are overridden for the text watcher. you can mask the text which you really wanted to. – Dinesh Prajapati Dec 17 '11 at 8:07 2 ...
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Using the Underscore module with Node.js

...rom Underscore, it overwrites the _ object with the result of my function call. Anyone know what's going on? For example, here is a session from the node.js REPL: ...
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Synchronous request in Node.js

If I need to call 3 http API in sequential order, what would be a better alternative to the following code: 18 Answers ...