大约有 46,000 项符合查询结果（耗时：0.0573秒） [XML]
Most efficient way to store thousand telephone numbers
... the first m bits are 1...11 - this last count is 1000(decimal). There are 2^m such counts and each count is at most 1000. If we omit the last one (because we know it is 1000 anyway), we can store all of these numbers in a contiguous block of (2^m - 1) * 10 bits. (10 bits is enough for storing a num...
Can't create handler inside thread that has not called Looper.prepare()
...
27 Answers
27
Active
...
What is the difference between UNION and UNION ALL?
...
26 Answers
26
Active
...
How to tell whether a point is to the right or left side of a line
I have a set of points. I want to separate them into 2 distinct sets. To do this, I choose two points ( a and b ) and draw an imaginary line between them. Now I want to have all points that are left from this line in one set and those that are right from this line in the other set.
...
How to write header row with csv.DictWriter?
...
Edit:
In 2.7 / 3.2 there is a new writeheader() method. Also, John Machin's answer provides a simpler method of writing the header row.
Simple example of using the writeheader() method now available in 2.7 / 3.2:
from collections imp...
Python str vs unicode types
Working with Python 2.7, I'm wondering what real advantage there is in using the type unicode instead of str , as both of them seem to be able to hold Unicode strings. Is there any special reason apart from being able to set Unicode codes in unicode strings using the escape char \ ?:
...
How to get a list of repositories apt-get is checking? [closed]
... |
edited Jun 18 '12 at 23:03
Ry-♦
192k4444 gold badges392392 silver badges403403 bronze badges
...
Fast check for NaN in NumPy
...
162
Ray's solution is good. However, on my machine it is about 2.5x faster to use numpy.sum in place...