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How to remove all the null elements inside a generic list in one go?
...null.
Here's a test:
class Test { }
class Program
{
static void Main(string[] args)
{
var list = new List<Test>();
list.Add(null);
Console.WriteLine(list.OfType<Test>().Count());// 0
list.Add(new Test());
Console.WriteLine(list.OfType<...
How to sort a dataFrame in python pandas by two or more columns?
...orts with numeric values, while pd.DataFrame.sort_values works with either string or numeric values. Using np.lexsort with strings will give: TypeError: bad operand type for unary -: 'str'.
share
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...
Passing a list of kwargs?
... another function's kwargs. Consider this code: (newlines don't seem to be allowed in comments) def a(**kw): print(kw), and def b(**kw): a(kw). This code will generate an error because kwargs is actually a dictionary, and will be interpreted as a regular argument of the dict type. Which is why chang...
栈和队列的面试题Java实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... this.data = data;
}
}
public static void main(String[] args) {
Stack stack = new Stack();
stack.push(1);
stack.push(2);
stack.push(3);
System.out.println(stack.pop().data);
System.out.println(stack.pop().data);
...
How to get a list of current open windows/process with Java?
...pproach to parse the the process list from the command "ps -e":
try {
String line;
Process p = Runtime.getRuntime().exec("ps -e");
BufferedReader input =
new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
Sy...
Will using goto leak variables?
...'s not explicitly initialised:
int main() {
goto lol;
{
std::string x;
lol:
x = "";
}
}
// error: jump to label ‘lol’
// error: from here
// error: crosses initialization of ‘std::string x’
... except for certain kinds of object, which the language can handle re...
What is the difference between == and Equals() for primitives in C#?
...he C# spec may say that the contents of a storage location of type List<String>.Enumerator and a heap object of type List<String>.Enumerator are the same, but the ECMA/CLI spec says they're different, and even when used in C# they behave differently.
– supercat
...
How do I join two paths in C#?
...
You have to use Path.Combine() as in the example below:
string basePath = @"c:\temp";
string filePath = "test.txt";
string combinedPath = Path.Combine(basePath, filePath);
// produces c:\temp\test.txt
sh...
What are some common uses for Python decorators? [closed]
...Method(ID, name):
if not (myIsType(ID, 'uint') and myIsType(name, 'utf8string')):
raise BlaBlaException() ...
I just declare:
@accepts(uint, utf8string)
def myMethod(ID, name):
...
and accepts() does all the work for me.
...
Show dialog from fragment?
...essage("Sure you wanna do this!")
.setNegativeButton(android.R.string.no, new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// do nothing (will close dialog)
}
})
...