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Does Python have “private” variables in classes?
...t will fail:
>>>x = A()
>>>x.__var # this will return error: "A has no attribute __var"
>>>x.printVar() # this gives back 123
But you can easily get away with this:
>>>x.__dict__ # this will show everything that is contained in object x
# w...
How to customize a Spinner in Android
...height value to "?attr/dropdownListPreferredItemHeight" or you will get an error: "Error: Attribute is not public"
– Loenix
Jun 14 '16 at 6:05
9
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How do I create a unique constraint that also allows nulls?
... trying to do exactly this in SQL Server 2008 Express edition and I get an error as follows: CREATE UNIQUE NONCLUSTERED INDEX UC_MailingId ON [SLS-CP].dbo.MasterFileEntry(MailingId) WHERE MailingId IS NOT NULL Results in: Msg 156, Level 15, State 1, Line 3 Incorrect syntax near the keyword 'WHE...
Getting all types that implement an interface
...y in our CI-environment. GetLoadableTypes was a fix for this solution. The error wouldn't be reproducible in the local environment and it was this: System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more inform...
Running a specific test case in Django when your app has a tests directory
... Attention people like me who blindly paste from Stackoverflow: This will error without the mentioned plugin, use the syntax described in the other answer (. instead of :) which works in Django 1.6+.
– Andy Smith
Oct 8 '16 at 11:11
...
Will the Garbage Collector call IDisposable.Dispose for me?
...lly "override" the Object.Finalize method in C#, the compiler generates an error: Do not override object.Finalize. Instead, provide a destructor. ; i.e. you must implement a destructor that effectively acts as the Finalizer. [just added here for completeness as this is the accepted answer and most l...
How do I check if a list is empty?
...eq = numpy.array([1,2,3]) followed by if not seq raises an exception "ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()"
– Mr.WorshipMe
Mar 20 '19 at 18:03
...
Infinite scrolling with React JS
... }
})
.catch(error => console.log('err ' + error));
}
}
componentDidMount() {
this.fetchData();
}
render() {
const loader = <div className="loader">Loading ...</div>;
let JobItems; ...
Remove duplicate rows in MySQL
...licate rows. As an added benefit, future INSERTs that are duplicates will error out. As always, you may want to take a backup before running something like this...
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What's the difference between String(value) vs value.toString()
...ll or undefined, you can't use the toString method, it will give you a TypeError exception:
var value = null;
String(null); // "null"
value.toString(); // TypeError
The String constructor called as a function would be roughly equivalent to:
value + '';
The type conversion rules from Object...