大约有 45,000 项符合查询结果（耗时：0.0767秒） [XML]
What is memoization and how can I use it in Python?
... return k * factorial(k - 1)
factorial = Memoize(factorial)
A feature known as "decorators" was added in Python 2.4 which allow you to now simply write the following to accomplish the same thing:
@Memoize
def factorial(k):
if k < 2: return 1
return k * factorial(k - 1)
The Python D...
Simplest two-way encryption using PHP
... guys, just FYI => MCRYPT IS DEPRECATED. capsing so everyone should know not to use it as it gave us a myriad of issues. It deprecated since PHP 7.1 if i'm not mistaken.
– clusterBuddy
Jun 3 '19 at 10:29
...
unique object identifier in javascript
I need to do some experiment and I need to know some kind of unique identifier for objects in javascript, so I can see if they are the same. I don't want to use equality operators, I need something like the id() function in python.
...
What is a “callable”?
Now that it's clear what a metaclass is , there is an associated concept that I use all the time without knowing what it really means.
...
Android Studio installation on Windows 7 fails, no JDK found
...However, I capitalized the "C" and removed the trailing slash and it works now: "C:\Program Files\Java\jdk1.7.0"
– ASeale
May 16 '13 at 12:08
...
Python division
...2.7 and Python 3.3.
In Python 2.7 and Python 3.3:
>>>20//15
1
Now, see the comparison
>>>a = 7.0/4.0
>>>b = 7/4
>>>print a == b
For the above program, the output will be False in Python 2.7 and True in Python 3.3.
In Python 2.7 a = 1.75 and b = 1.
In Pyth...
How to create local notifications?
...alloc] init];
notification.fireDate = [NSDate dateWithTimeIntervalSinceNow:7];
notification.alertBody = @"This is local notification!";
notification.timeZone = [NSTimeZone defaultTimeZone];
notification.soundName = UILocalNotificationDefaultSoundName;
notification.applicationIcon...
How to redirect 404 errors to a page in ExpressJS?
I don't know a function for doing this, does anyone know of one?
22 Answers
22
...
How do you detect where two line segments intersect? [closed]
...bering that s × r = − r × s):
u = (q − p) × r / (r × s)
Now there are four cases:
If r × s = 0 and (q − p) × r = 0, then the two lines are collinear.
In this case, express the endpoints of the second segment (q and q + s) in terms of the equation of the first li...
What do I use for a max-heap implementation in Python?
...
But you have to remember to wrap and unwrap your values, which requires knowing if you are dealing with a min- or max-heap.
MinHeap, MaxHeap classes
Adding classes for MinHeap and MaxHeap objects can simplify your code:
class MinHeap(object):
def __init__(self): self.h = []
def heappush(self, ...