大约有 40,000 项符合查询结果（耗时：0.0554秒） [XML]
Does Python support multithreading? Can it speed up execution time?
...thon use a different threading implementation (the native Java VM and .NET common runtime threads respectively).
To address your update directly: Any task that tries to get a speed boost from parallel execution, using pure Python code, will not see a speed-up as threaded Python code is locked to on...
Using sed, how do you print the first 'N' characters of a line?
...
|
show 3 more comments
45
...
What is a proper naming convention for MySQL FKs?
...
add a comment
|
28
...
XPath to select multiple tags
...sing | can solve the original problem, but it results in a longer and more complex and challenging to understand XPath expression. The simpler expression in this answer, which uses the or operator produces the wanted node-set and can be specified in the "select" attribute of an <xsl:for-each> ...
How do I write good/correct package __init__.py files
...
add a comment
|
114
...
What is the difference between NaN and None?
...ut[13]: dtype('O')
In [14]: s_good.dtype
Out[14]: dtype('float64')
Jeff comments (below) on this:
np.nan allows for vectorized operations; its a float value, while None, by definition, forces object type, which basically disables all efficiency in numpy.
So repeat 3 times fast: ob...
How do you append to an already existing string?
...
add a comment
|
29
...
How do you set the text in an NSTextField?
...
add a comment
|
44
...
Default value of function parameter
... {
...
}
test.cpp
#include "lib.h"
int main() {
Add(4);
}
The compilation of test.cpp will not see the default parameter declaration, and will fail with an error.
For this reason, the default parameter definition is usually specified in the function declaration:
lib.h
int Add(int a, ...