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Identify if a string is a number
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int n;
bool isNumeric = int.TryParse("123", out n);
Update As of C# 7:
var isNumeric = int.TryParse("123", out int n);
or if you don't need the number you can discard the out parameter
var isNumeric = int.TryParse("123", out _);
The var s can be replaced ...
Python multiprocessing PicklingError: Can't pickle
...
Here is a list of what can be pickled. In particular, functions are only picklable if they are defined at the top-level of a module.
This piece of code:
import multiprocessing as mp
class Foo():
@staticmethod
def work(self):
pass
if __name__ == '__main__': ...
Is it Pythonic to use list comprehensions for just side effects?
Think about a function that I'm calling for its side effects, not return values (like printing to screen, updating GUI, printing to a file, etc.).
...
How to inspect the return value of a function in GDB?
Is it possible to inspect the return value of a function in gdb assuming the return value is not assigned to a variable?
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Detecting when user has dismissed the soft keyboard
...ow...
So I created a more neat solution with Kotlin
1.Create an extension function:
fun Activity.addKeyboardToggleListener(onKeyboardToggleAction: (shown: Boolean) -> Unit): KeyboardToggleListener? {
val root = findViewById<View>(android.R.id.content)
val listener = KeyboardToggl...
How to convert SecureString to System.String?
... Andrew ArnottAndrew Arnott
72.7k2424 gold badges123123 silver badges162162 bronze badges
...
How to Query an NTP Server using C#?
...ntry(ntpServer).AddressList;
//The UDP port number assigned to NTP is 123
var ipEndPoint = new IPEndPoint(addresses[0], 123);
//NTP uses UDP
using(var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
{
socket.Connect(ipEndPoint);
...
A semantics for Bash scripts?
...ion.
$ foo() { echo $x; }
$ bar() { local x; echo $x; }
$ foo
$ bar
$ x=123
$ foo
123
$ bar
$ …
Environment and process "scope"
Subshells inherit the variables of their parent shells, but other kinds of processes don't inherit unexported names.
$ x=123
$ ( echo $x )
123
$ bash -c 'echo $x'...
convert ArrayList to JSONArray
...s
import com.google.gson.Gson
import com.google.gson.reflect.TypeToken
fun <T> Gson.convertToJsonString(t: T): String {
return toJson(t).toString()
}
fun <T> Gson.convertToModel(jsonString: String, cls: Class<T>): T? {
return try {
fromJson(jsonString, cls)
...
App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
...名，这些名称在任何数据库中都不建议使用中文。
与 TaifunSQLite 功能类似，但TaifunSQLite是收费的，美刀。
1.3版本更新（2025/09/24）
查询SQL结果优化为AppInventor标准的二维列表，通过列表索引可以取到单元格...