大约有 40,000 项符合查询结果（耗时：0.0410秒） [XML]
Get a filtered list of files in a directory
...ns for filtering, and it can have some memory overhead for very large data sets, but for listing a directory and other simple string filtering tasks, list comprehensions lead to more clean documentable code.
The only thing about this design is that it doesn't protect you against making the mistake ...
How to generate all permutations of a list?
...None else r
for indices in product(range(n), repeat=r):
if len(set(indices)) == r:
yield tuple(pool[i] for i in indices)
share
|
improve this answer
|
...
Creating a dictionary from a csv file?
...ion. d = dict(reader) is much shorter and significantly faster on huge datasets.
– Alex Laskin
Jul 19 '11 at 1:44
...
Selecting the first “n” items with jQuery
...uch cleaner, using slice is much more efficient if you have a large result set to start with. Unfortunately, when evaluating ":lt" and other positional selectors, jQuery loops through the entire set, even if it's just getting the first element. I've written more about this on my blog here: spadgos.c...
Replacing .NET WebBrowser control with a better browser, like Chrome?
...ve had pretty bad experiences of using WebKit with C# and finally I had to settle on the default web browser component which comes with .NET
– Sumit Ghosh
Dec 10 '10 at 23:54
1
...
Why doesn't 'ref' and 'out' support polymorphism?
... it, right? You write a Tiger to a variable of type Animal and you're all set, right?
Wrong. The rule is not "N can only write to n".
The rules are, briefly:
1) N has to write to n before N returns normally. (If N throws, all bets are off.)
2) N has to write something to n before it reads so...
Rails 4 multiple image or file upload using carrierwave
How can I upload multiple images from a file selection window using Rails 4 and CarrierWave? I have a post_controller and post_attachments model. How can I do this?
...
Call a function with argument list in python
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...
how to run two commands in sudo?
...ing like:
sudo -u db2inst1 -s -- "db2 connect to ttt; db2 UPDATE CONTACT SET EMAIL_ADDRESS = 'mytestaccount@gmail.com'"
If your sudo version doesn't work with semicolons with -s (apparently, it doesn't if compiled with certain options), you can use
sudo -- sh -c 'whoami; whoami'
instead, whi...
When splitting an empty string in Python, why does split() return an empty list while split('\n') re
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...