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When is “i += x” different from “i = i + x” in Python?
...s is why
i = 1
i += 1
seems to increment i. In reality, you get a new integer and assign it "on top of" i -- losing one reference to the old integer. In this case, i += 1 is exactly the same as i = i + 1. But, with most mutable objects, it's a different story:
As a concrete example:
a = [1,...
How to find all occurrences of an element in a list?
...an the numpy solution if you already have the array, otherwise the cost of converting outweighs the speed gain (tested on integer lists with 100, 1000 and 10000 elements).
NOTE: A note of caution based on Chris_Rands' comment: this solution is faster than the list comprehension if the results are s...
Check whether a string matches a regex in JS
...fails because numbers don't have a match member). I'd reccomend explicitly converting your number to a string if you want to use it with a regex (String(123) for example).
– Bronzdragon
Jan 20 '19 at 14:47
...
How can I tell jackson to ignore a property for which I don't have control over the source code?
...
You can use Jackson Mixins. For example:
class YourClass {
public int ignoreThis() { return 0; }
}
With this Mixin
abstract class MixIn {
@JsonIgnore abstract int ignoreThis(); // we don't need it!
}
With this:
objectMapper.getSerializationConfig().addMixInAnnotations(YourClas...
Testing if object is of generic type in C#
...t.GetType().GetGenericTypeDefinition() == typeof(List<>);
As Jon points out, this checks the exact type equivalence. Returning false doesn't necessarily mean list is List<T> returns false (i.e. the object cannot be assigned to a List<T> variable).
...
Execute another jar in a Java program
...lic class Test{
public static void main(String []args){
System.out.println("Hello from Test");
}
}
Use Process class and it's methods,
public class Exec
{
public static void main(String []args) throws Exception
{
Process ps=Runtime.getRuntime().exec(new String[]{"java","-ja...
MySQL ON vs USING?
...ith ON while it appears only once with USING:
mysql> create table t(i int);insert t select 1;create table t2 select*from t;
Query OK, 0 rows affected (0.11 sec)
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
Query OK, 1 row affected (0.19 sec)
Records: 1 Duplicate...
Is there a Google Keep API? [closed]
...ered Google Tasks, and saw that it had an Android app, web app, and API, I converted over to Tasks. This may not directly answer your question, but it is my solution to the Keep API problem.
Tasks doesn't have a reminder alarm exactly like Keep. I can live without that if I also connect with the ...
list.clear() vs list = new ArrayList(); [duplicate]
...
public void clear() {
modCount++;
// Let gc do its work
for (int i = 0; i < size; i++)
elementData[i] = null;
size = 0;
}
share
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What is the C# equivalent of friend? [duplicate]
...nt of "friend" - the closest that's available (and it isn't very close) is InternalsVisibleTo. I've only ever used this attribute for testing - where it's very handy!
Example: To be placed in AssemblyInfo.cs
[assembly: InternalsVisibleTo("OtherAssembly")]
...