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Greedy vs. Reluctant vs. Possessive Quantifiers
...er tries to match the f following, but the unmatched portion of the string starts with "x" so that doesn't work. So the matcher backtracks, making the non-greedy quantifier match one more character (now it matches the "x", leaving "fooxxxxxxfoo" unmatched). Then it tries to match the f, which succee...
PSQLException: current transaction is aborted, commands ignored until end of transaction block
...sql_insert()
{
try
{
connection.setAutoCommit(false); //start of transaction.
Statement statement = connection.createStatement();
System.out.println("start doing statement.execute");
statement.execute(
"insert into...
Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
...a.util.LinkedList;
public class Search {
private static final String START = "B";
private static final String END = "E";
public static void main(String[] args) {
// this graph is directional
Graph graph = new Graph();
graph.addEdge("A", "B");
graph.addE...
GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
...件路径
返回值：数字类型，GIF动画的总帧数
Start 开始播放()
开始播放GIF动画。
Stop 停止播放()
停止播放GIF动画。
SetLoop 设置循环(是否循环)
设置GIF动画是否循环播放。
是否循环：布尔类型，true表示...
Generate list of all possible permutations of a string
...ing individually. (the variable index in the code below keeps track of the start of the last and the next iteration)
Some pseudocode:
list = originalString.split('')
index = (0,0)
list = [""]
for iteration n in 1 to y:
index = (index[1], len(list))
for string s in list.subset(index[0] to end):...
Rotating a two-dimensional array in Python
...ist slicing. This gives you a "sublist" of the original list described by [start:end:step], start is the first element, end is the last element to be used in the sublist. step says take every step'th element from first to last. Omitted start and end means the slice will be the entire list, and the n...
The first day of the current month in php using date_modify as DateTime object
... give the min and max boundaries for time in the month by doing: $monthStart = date('Y-m-01 00:00:00'); $monthEnd = date('Y-m-t 23:59:59');
– H2ONOCK
Jun 9 '15 at 8:15
...
Wrapping a C library in Python: C, Cython or ctypes?
...not do that with ctypes. So you have to switch languages at that point and start rewriting parts of your code, potentially reverse engineering your Python/ctypes code into plain C, thus spoiling the whole benefit of writing your code in plain Python in the first place.
With Cython, OTOH, you're com...
How can I multiply all items in a list together with Python?
...we're only dealing with primitives here, you can avoid the minor kludge of starting with 1 by starting with list[0] and iterating over list[1:]. Though getting comfortable with the more functional 'reduce' answers here is valuable in the long term as it's also useful in other circumstances.
...
How to get the return value from a thread in python?
...th multiprocessing and the thread pool is that it much slower to setup and start threads compared to the basic threading library. It's great for starting long running threads but defeat the purpose when needing to start a lot of short running threads. The solution of using "threading" and "Queue" d...