大约有 13,916 项符合查询结果（耗时：0.0270秒） [XML]
Python: most idiomatic way to convert None to empty string?
...lt-in, but return an empty string when the argument is None, do this:
def xstr(s):
if s is None:
return ''
return str(s)
share
|
improve this answer
|
follo...
How can a Javascript object refer to values in itself? [duplicate]
... it works only if you have a flat obj, like the one in your example. It will not work if you have nested keys.
– Green
Sep 29 '15 at 3:26
1
...
How to output numbers with leading zeros in JavaScript [duplicate]
I can round to x amount of decimal places with math.round but is there a way to round left of the decimal? for example 5 becomes 05 if I specify 2 places
...
Numpy: Get random set of rows from 2D array
... 1],
[0, 4, 1],
[2, 4, 2],
[3, 3, 1]])
>>> idx = np.random.randint(10, size=2)
>>> idx
array([7, 6])
>>> A[idx,:]
array([[0, 4, 1],
[1, 3, 1]])
Putting it together for a general case:
A[np.random.randint(A.shape[0], size=2), :]
For non repl...
Storing Image Data for offline web application (client-side storage database)
...sting
171 PNG files (total of 3.2MB)
Platforms tested: Chrome v24, FireFox 18, IE 10
Should also work with Chrome & FF for Android
Fetch from web server
using XHR2 (supported on almost all browsers) for blob download from web server
I went with XHR2-Lib by Phil Parsons, which is very much ...
Two way/reverse map [duplicate]
...pe by subclassing dict and adding the logic that you want. Here's a basic example:
class TwoWayDict(dict):
def __setitem__(self, key, value):
# Remove any previous connections with these values
if key in self:
del self[key]
if value in self:
del s...
how to get request path with express req object
I'm using express + node.js and I have a req object, the request in the browser is /account but when I log req.path I get '/' --- not '/account'.
...
Efficient SQL test query or validation query that will work across all (or most) databases
...aries provide the ability to test their SQL connections for idleness. For example, the JDBC pooling library c3p0 has a property called preferredTestQuery , which gets executed on the connection at configured intervals. Similarly, Apache Commons DBCP has validationQuery .
...
How do I create a unique ID in Java? [duplicate]
...yone (as the entire space is larger than the number of atoms estimated to exist in the Universe) as to be 100% guaranteed. And if you need global uniqueness, it is the easiest way to achieve that. However, if you only need local uniqueness (i.e. to a current existing application) then AtomicIntege...
How can I pass an argument to a PowerShell script?
...erPosition = $iTunes.PlayerPosition + $step
}
Call it with
powershell.exe -file itunesForward.ps1 -step 15
share
|
improve this answer
|
follow
|
...