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Why is the order in dictionaries and sets arbitrary?
I don't understand how looping over a dictionary or set in python is done by 'arbitrary' order.
6 Answers
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How good is Java's UUID.randomUUID?
...between JVMs (meaning that any concrete statements made are valid only for one specific JVM), it does mandate that the output must pass a statistical random number generator test.
It's always possible for an implementation to contain subtle bugs that ruin all this (see OpenSSH key generation bug) b...
Interface or an Abstract Class: which one to use?
...lasses.
Another thing to keep in mind is client classes can only extend one abstract class, whereas they can implement multiple interfaces. So, if you're defining your behavior contracts in abstract classes, that means each child class may only conform to a single contract. Sometimes this a goo...
PHP substring extraction. Get the string before the first '/' or the whole string
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+1 Thanks for the answer. It worked :) But one question. I am only able to do this -> $arr = explode('/',$mystring,2); echo $arr[0];. I am unable to get the first string in one statement itself - echo explode('/',$mystring,2)[0];. Since explode returns an array, I ...
How do I parse an ISO 8601-formatted date?
...hon-dateutil package can parse not only RFC 3339 datetime strings like the one in the question, but also other ISO 8601 date and time strings that don't comply with RFC 3339 (such as ones with no UTC offset, or ones that represent only a date).
>>> import dateutil.parser
>>> date...
Border around specific rows in a table?
...table). For example, you can select all rows except the top two and bottom one with tr:not(:nth-child(-n+2)):not(:nth-last-child(1))
– B T
Jul 11 '14 at 19:05
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Create an empty object in JavaScript with {} or new Object()?
...e's similarly almost no benefit to ever using new Array(); over []; - with one minor exception:
var emptyArray = new Array(100);
creates a 100 item long array with all slots containing undefined - which may be nice/useful in certain situations (such as (new Array(9)).join('Na-Na ') + 'Batman!')....
jQuery: how to change title of document during .ready()?
I am using some nested layouts in Ruby on Rails, and in one of the layouts i have a need to read in a string from a div and set that as the title of the document. What is correct way (if any) to set the title of the document?
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Read a file one line at a time in node.js?
I am trying to read a large file one line at a time. I found a question on Quora that dealt with the subject but I'm missing some connections to make the whole thing fit together.
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Returning multiple values from a C++ function
...hat divides two integers and returns both the quotient and the remainder. One way I commonly see is to use reference parameters:
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