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Is there any difference between “foo is None” and “foo == None”?
...eq__() method. It doesn't cares about identity.
In [102]: x, y, z = 2, 2, 2.0
In [103]: id(x), id(y), id(z)
Out[103]: (38641984, 38641984, 48420880)
In [104]: x is y
Out[104]: True
In [105]: x == y
Out[105]: True
In [106]: x is z
Out[106]: False
In [107]: x == z
Out[107]: True
None is a sing...
Find which version of package is installed with pip
... - active
simplejson - 2.5.0 - active
transaction - 1.2.0 - active
translationstring - 1.1 - active
venusian - 1.0a3 - active
waitress - 0.8.1 - active
wsgiref - 0.1.2 - active development (/usr/lib/python2.7)
yolk ...
JSON.Net Self referencing loop detected
... I've confirmed this solution also works with WebAPI EntityFramework Core 2.0
– cesar-moya
May 28 '18 at 19:45
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How do I get a reference to the app delegate in Swift?
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Here is the Swift 2.0 version:
let delegate = UIApplication.sharedApplication().delegate as? AppDelegate
And to access the managed object context:
if let delegate = UIApplication.sharedApplication().delegate as? AppDelegate {
...
Finding three elements in an array whose sum is closest to a given number
...fy the problem statement, instead we will search for aj and ak that sum to ai +S.
– Boolean
May 20 '11 at 14:59
3
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How to detect first time app launch on an iPhone
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Another idea for Xcode 7 and Swift 2.0 is to use extensions
extension NSUserDefaults {
func isFirstLaunch() -> Bool {
if !NSUserDefaults.standardUserDefaults().boolForKey("HasAtLeastLaunchedOnce") {
NSUserDefaults.standardUserDefaul...
Get the _id of inserted document in Mongo database in NodeJS
... The Callbacks API has changed: mongodb.github.io/node-mongodb-native/2.0/api/…
– tenbits
May 13 '15 at 13:10
l...
Best way to check if UITableViewCell is completely visible
... a visible cell in the
receiving table view.
Availability Available in iOS 2.0 and later.
See Also –
indexPathsForVisibleRows
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Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
... every polynomial factors uniquely (ring of polynomials is an Euclidean domain), this means ai are uniquely determined, up to permutation.
This ends a proof that remembering powers is enough to recover the numbers. For constant k, this is a good approach.
However, when k is varying, the direct app...
JSTL in JSF2 Facelets… makes sense?
...ivalent?
Should PARTIAL_STATE_SAVING be set to false?
Communication in JSF 2.0 - @ViewScoped fails in tag handlers
To see some real world examples where JSTL tags are helpful (i.e. when really properly used during building the view), see the following questions/answers:
How to make a grid of JSF...