大约有 40,000 项符合查询结果（耗时：0.0666秒） [XML]
Automatically capture output of last command into a variable using Bash?
...t know of any variable that does this automatically. To do something aside from just copy-pasting the result, you can re-run whatever you just did, eg
vim $(!!)
Where !! is history expansion meaning 'the previous command'.
If you expect there to be a single filename with spaces or other characte...
NULL vs nullptr (Why was it replaced?) [duplicate]
...with NULL is that people sometimes mistakenly believe that it is different from 0 and/or not an integer. In pre-standard code, NULL was/is sometimes defined to something unsuitable and therefore had/has to be avoided. That's less common these days.
If you have to name the null pointer, call it ...
Maximum Java heap size of a 32-bit JVM on a 64-bit OS
...er. On most modern 32-bit Windows systems the maximum heap size will range from 1.4G to 1.6G. On 32-bit Solaris kernels the address space is limited to 2G. On 64-bit operating systems running the 32-bit VM, the max heap size can be higher, approaching 4G on many Solaris systems.
(http://www.oracle....
How to add test coverage to a private constructor?
...oblems for Sonar's code coverage tool (when I do this the class disappears from the code coverage reports of Sonar).
– Adam Parkin
Mar 22 '13 at 20:14
...
Are nested try/except blocks in python a good programming practice?
...or:
raise AttributeError("The object doesn't have such attribute") from None
PS. has_key() has been deprecated for a long time in Python 2. Use item in self.dict instead.
share
|
improve t...
Haskell: Lists, Arrays, Vectors, Sequences
...nce list. The best example of lists screwing up performance tends to come from [Char] which the prelude has aliased as String. Char lists are convient, but tend to run on the order of 20 times slower than C strings, so feel free to use Data.Text or the very fast Data.ByteString. I'm sure there ar...
How do I check if a file exists in Java?
...e("C:/").exists() will return true but will not allow you to open and read from it as a file.
share
|
improve this answer
|
follow
|
...
How to get first element in a list of tuples?
...
From a performance point of view, in python3.X
[i[0] for i in a] and list(zip(*a))[0] are equivalent
they are faster than list(map(operator.itemgetter(0), a))
Code
import timeit
iterations = 100000
init_time = timeit.t...
Download a file by jQuery.Ajax
... window.URL.revokeObjectURL(url);
}
The function base64ToBlob was taken from here and must be used in compliance with this function
function base64ToBlob(base64, mimetype, slicesize) {
if (!window.atob || !window.Uint8Array) {
// The current browser doesn't have the atob function. C...
How to import the class within the same directory or sub directory?
...irectory as the files. That will signify to Python that it's "ok to import from this directory".
Then just do...
from user import User
from dir import Dir
The same holds true if the files are in a subdirectory - put an __init__.py in the subdirectory as well, and then use regular import statemen...