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Can Python test the membership of multiple values in a list?
I want to test if two or more values have membership on a list, but I'm getting an unexpected result:
10 Answers
...
What is “rvalue reference for *this”?
... parameter" of the function†:
// t.cpp
#include <iostream>
struct test{
void f() &{ std::cout << "lvalue object\n"; }
void f() &&{ std::cout << "rvalue object\n"; }
};
int main(){
test t;
t.f(); // lvalue
test().f(); // rvalue
}
Output:
$ clang++ -std=c++...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...! bin shcd ~mkdir shell_tutcd shell_tutfor ((i=0; i<10; i++)); do touch test_$i.txt...
什么是Shell脚本
示例
看个例子吧：
#!/bin/sh
cd ~
mkdir shell_tut
cd shell_tut
for ((i=0; i<10; i++)); do
touch test_$i.txt
done
示例解释
第1行：指定脚本解释器...
How do I properly escape quotes inside HTML attributes?
...
&quot; is the correct way, the third of your tests:
<option value="&quot;asd">test</option>
You can see this working below, or on jsFiddle.
alert($("option")[0].value);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.mi...
How to find all occurrences of a substring?
... powerful regular expressions:
import re
[m.start() for m in re.finditer('test', 'test test test test')]
#[0, 5, 10, 15]
If you want to find overlapping matches, lookahead will do that:
[m.start() for m in re.finditer('(?=tt)', 'ttt')]
#[0, 1]
If you want a reverse find-all without overlaps, y...
TDD/BDD screencast/video resources [closed]
...
I recorded a series of videos detailing how I've tested my indie-hacker software business over the years — codebase is big enough to be a real business but still comprehensible (about 14k LOC) — see here semicolonandsons.com/tag/testing
– Jack Kins...
How can I run a function from a script in command line?
...u could specify the function name as the first argument. Example:
$ cat test.sh
testA() {
echo "TEST A $1";
}
testB() {
echo "TEST B $2";
}
"$@"
$ bash test.sh
$ bash test.sh testA
TEST A
$ bash test.sh testA arg1 arg2
TEST A arg1
$ bash test.sh testB arg1 arg2
TEST B arg2
For polish, ...
What is a NullPointerException, and how do I fix it?
... if it was a real reference. For example, if you write this:
public class Test {
public static void main(String[] args) {
String foo = null;
int length = foo.length(); // HERE
}
}
the statement labeled "HERE" is going to attempt to run the length() method on a null refer...
`static` keyword inside function?
...nsider this:
class Foo
{
public function call()
{
static $test = 0;
$test++;
echo $test . PHP_EOL;
}
}
$a = new Foo();
$a->call(); // 1
$a->call(); // 2
$a->call(); // 3
$b = new Foo();
$b->call(); // 4
$b->call(); // 5
If you want a static ...
How to import classes defined in __init__.py
...
You just put them in __init__.py.
So with test/classes.py being:
class A(object): pass
class B(object): pass
... and test/__init__.py being:
from classes import *
class Helper(object): pass
You can import test and have access to A, B and Helper
>>> i...