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What is the most efficient way of finding all the factors of a number in Python?
Can someone explain to me an efficient way of finding all the factors of a number in Python (2.7)?
22 Answers
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What do Clustered and Non clustered index actually mean?
...y on the disk in the same order as the index. Therefore, there can be only one clustered index.
With a non clustered index there is a second list that has pointers to the physical rows. You can have many non clustered indices, although each new index will increase the time it takes to write new rec...
What's the difference between struct and class in .NET?
...ence to somewhere else in memory where the actual value resides.
This has one benefit, to begin with:
value types always contains a value
reference types can contain a null-reference, meaning that they don't refer to anything at all at the moment
Internally, reference types are implemented as p...
How do I concatenate strings and variables in PowerShell?
...this, please.
The double quotes are for when you want some pre-processing done (such as variables, special characters, etc.)
So:
$name = "Marshall Bruce Mathers III"
Write-Host "$name"
-> Marshall Bruce Mathers III
Whereas:
$name = "Marshall Bruce Mathers III"
Write-Host '$name'
-> $name
(I ...
How does one parse XML files? [closed]
...List girlAge = xmlDoc.GetElementsByTagName("gAge");
XmlNodeList girlCellPhoneNumber = xmlDoc.GetElementsByTagName("gPhone");
// Display the results
Console.WriteLine("Address: " + girlAddress[0].InnerText);
Console.WriteLine("Age: " + girlAge[0].InnerText);
Console.WriteLine("Phone Number: " + gir...
Why use a ReentrantLock if one can use synchronized(this)?
...'m trying to understand what makes the lock in concurrency so important if one can use synchronized (this) . In the dummy code below, I can do either:
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Difference between method and function in Scala
...ns (6.23) and Method Values (6.7). Curiously, function values is spoken of one time on 3.2.9, and no where else.
A Function Type is (roughly) a type of the form (T1, ..., Tn) => U, which is a shorthand for the trait FunctionN in the standard library. Anonymous Functions and Method Values have fu...
Best Practices: Salting & peppering passwords?
...
Ok. Seeing as I need to write about this over and over, I'll do one last canonical answer on pepper alone.
The Apparent Upside Of Peppers
It seems quite obvious that peppers should make hash functions more secure. I mean, if the attacker only gets your database, then your users password...
Understanding “randomness”
... part of the intuition, at least for sums. Imagine taking the "average" of one rolled die. Now imagine taking the average of two dice. Now one hundred. What happens to the chance of getting a one or a six for the average as you add more dice?
– johncip
Oct 18 '...
What's the nearest substitute for a function pointer in Java?
...ctly the same thing, except for a small calculation that's going to change one line of code. This is a perfect application for passing in a function pointer to replace that one line, but Java doesn't have function pointers. What's my best alternative?
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