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Why not abstract fields?
...he final through the super constructor the compiler will give a warning an error, just like when an abstract method is not implemented.
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How do I check if a string is valid JSON in Python?
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You can try to do json.loads(), which will throw a ValueError if the string you pass can't be decoded as JSON.
In general, the "Pythonic" philosophy for this kind of situation is called EAFP, for Easier to Ask for Forgiveness than Permission.
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How do I compare version numbers in Python?
...on)
True
>>> version.Version("1.3.xy123")
Traceback (most recent call last):
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packaging.version.InvalidVersion: Invalid version: '1.3.xy123'
packaging.version.parse is a third-party utility but is used by setuptools (so you probably already have it installed) and is conformant to the c...
How are feature_importances in RandomForestClassifier determined?
... the tree: for each internal node that splits on feature i you compute the error reduction of that node multiplied by the number of samples that were routed to the node and add this quantity to feature_importances[i].
The error reduction depends on the impurity criterion that you use (e.g. Gini, E...
SQL-Server: Is there a SQL script that I can use to determine the progress of a SQL Server backup or
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Yes. If you have installed sp_who2k5 into your master database, you can simply run:
sp_who2k5 1,1
The resultset will include all the active transactions. The currently running backup(s) will contain the string "BACKUP" in the requestCommand fi...
Is there a way to simulate the C++ 'friend' concept in Java?
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Here is a small trick that I use in JAVA to replicate C++ friend mechanism.
Lets say I have a class Romeo and another class Juliet. They are in different packages (family) for hatred reasons.
Romeo wants to cuddle Juliet and Juliet wan...
Reintegrate can only be used if revisions X through Y were previously merged from to reintegra
... answer sounds reasonable, it did not work for me. I kept getting the same error messages. What helped, was to remove the svn:mergeinfo properties from the listed files, just like the accepted answer is suggesting.
– Jenny O'Reilly
Apr 21 '15 at 11:59
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Pandas convert dataframe to array of tuples
...ou want normal tuples in your zip iterator (instead of namedtuples), then call: data_set.itertuples(index=False, name=None)
– Axel
Oct 25 '17 at 9:47
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get and set in TypeScript
...e(name: string) {
if (name.length > 10) {
throw new Error("Name has a max length of 10");
}
this._name = name;
}
doStuff () {
this._name = 'foofooooooofoooo';
}
}
const person = new Person('Willem');
// doesn't throw error, setter fu...
What would a “frozen dict” be?
...rom putting a mutable list as a value, in which case hashing will throw an error. There's nothing necessarily wrong with that, but users should be aware. Another thing: This hashing algorithm is poorly chosen, very prone to hash collisions. For example {'a':'b'} hashes the same as {'b':'a'} and {'a'...