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How do you split a list into evenly sized chunks?
...unks you want:
def chunks(lst, n):
"""Yield successive n-sized chunks from lst."""
for i in range(0, len(lst), n):
yield lst[i:i + n]
import pprint
pprint.pprint(list(chunks(range(10, 75), 10)))
[[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29]...
Java NIO FileChannel versus FileOutputstream performance / usefulness
...ing obvious bottlenecks, which I suggest your micro-benchmark might suffer from. Potential areas for investigating:
The buffer size. The algorithm you basically have is
copy from disk to buffer
copy from buffer to disk
My own experience has been that this buffer size is ripe for tuning. I've...
The case against checked exceptions
...spect Goslings motivation for not putting operator overrides in Java comes from a similar argument - they confuse the programmer because they are often abused.
But in the end, I find it a bogus argument of Hejlsberg's and possibly a post-hoc one created to explain the lack rather than a well though...
How can I suppress all output from a command using Bash?
...sn't any option for this program to be quiet. How can I prevent the script from displaying anything?
7 Answers
...
How do I make and use a Queue in Objective-C?
...ay (QueueAdditions)
// Queues are first-in-first-out, so we remove objects from the head
- (id) dequeue {
// if ([self count] == 0) return nil; // to avoid raising exception (Quinn)
id headObject = [self objectAtIndex:0];
if (headObject != nil) {
[[headObject retain] autorelease]...
How do I remove the old history from a git repository?
...
Quoted from the linked wiki page on grafts. "As of Git 1.6.5, the more flexible git replace has been added, which allows you to replace any object with any other object, and tracks the associations via refs which can be pushed and p...
Difference between wait() and sleep()
...l sleep on Thread.
Yet another point is that you can get spurious wakeups from wait (i.e. the thread which is waiting resumes for no apparent reason). You should always wait whilst spinning on some condition as follows:
synchronized {
while (!condition) { mon.wait(); }
}
...
What is the difference between quiet NaN and signaling NaN?
I have read about floating-point and I understand that NaN could result from operations. But I can't understand what these are concepts exactly. What is the difference between them?
...
Why does calling a method in my derived class call the base class method?
...tion. You cannot create instances of abstract classes, but you can inherit from them and create instances of your inherited classes and access them using the base class definition. In your example this would look like:
public abstract class Person
{
public abstract void ShowInfo();
}
public cl...
Load multiple packages at once
...dplyr, psych, tm)
and if the package is missing p_load will download it from CRAN or Bioconductor.
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