大约有 40,000 项符合查询结果（耗时：0.0607秒） [XML]
What is the difference between ndarray and array in numpy?
...o create an array using numpy.ndarray, but it is not the recommended way. From the docstring of numpy.ndarray:
Arrays should be constructed using array, zeros or empty ... The parameters given here refer to a
low-level method (ndarray(...)) for instantiating an array.
Most of the meat of...
How to use the new affix plugin in twitter's bootstrap 2.1.0?
...ce. In your case, once 50px is scrolled, the class on your item is changed from .affix-top to .affix. You'd probably want to set data-offset-top to about 130px in your use case.
Once this class change occurs, you must position your element in css by styling the positioning for class .affix. Bootstr...
Django using get_user_model vs settings.AUTH_USER_MODEL
...butes, as well as if you want to define a ForeignKey/ManyToMany-relation.
From the changelog:
get_user_model() can now be called at import time, even in modules that define models.
so... is there still a reason to use settings.AUTH_USER_MODEL? Well, the docs still recommend the settings.AUTH_...
What is time_t ultimately a typedef to?
...brary defined for storing
system time values. Such values are
returned from the standard time()
library function. This type is a
typedef defined in the standard
header. ISO C defines
time_t as an arithmetic type, but does
not specify any particular type,
range, resolution, or encodi...
How do I use itertools.groupby()?
...eturns iterators.
Here's an example of that, using clearer variable names:
from itertools import groupby
things = [("animal", "bear"), ("animal", "duck"), ("plant", "cactus"), ("vehicle", "speed boat"), ("vehicle", "school bus")]
for key, group in groupby(things, lambda x: x[0]):
for thing in ...
How to commit no change and new message?
...h temporary workflow artifacts and make it hard to separate code revisions from ephemeral cruft.
Other strategies to add metadata to a commit tree include:
Separate branches or lightweight tags that always point to a commit of a particular status (e.g. "last accepted commit" or "current staging co...
Express.js - app.listen vs server.listen
...fig.port, function() {
console.log('Https App started');
});
The app from express will return http server only, you cannot set it in express, so you will need to use the https server command
var express = require('express');
var app = express();
app.listen(1234);
...
C++ Exceptions questions on rethrow of original exception
...Err(const MyErr& other) {
printf(" Base copy-constructor, this=%p from that=%p\n", this, &other);
}
virtual ~MyErr() {
printf(" Base destructor, this=%p\n", this);
}
};
struct MyErrDerived : public MyErr {
MyErrDerived() {
printf(" Derived default constructor, this=%p...
Finding differences between elements of a list
...
You can use itertools.tee and zip to efficiently build the result:
from itertools import tee
# python2 only:
#from itertools import izip as zip
def differences(seq):
iterable, copied = tee(seq)
next(copied)
for x, y in zip(iterable, copied):
yield y - x
Or using iterto...
Is it possible to run JavaFX applications on iOS, Android or Windows Phone 8?
...es
JavaFXPorts SDK for android, iOS and embedded devices can be downloaded from here
JavaFXPorts project is still thriving and it is easier than ever to run JavaFX on mobile devices, all thanks to the IDE plugins that is built on top of these SDKs and gets you started in a few minutes without the ha...