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How to generate all permutations of a list?
...re using an older Python (<2.6) for some reason or are just curious to know how it works, here's one nice approach, taken from http://code.activestate.com/recipes/252178/:
def all_perms(elements):
if len(elements) <=1:
yield elements
else:
for perm in all_perms(elemen...
TypeError: unhashable type: 'dict'
...ntation of it like this:
>>> key = frozenset(dict_key.items())
Now you may use key as a key in a dict or set:
>>> some_dict[key] = True
>>> some_dict
{frozenset([('a', 'b')]): True}
Of course you need to repeat the exercise whenever you want to look up something usin...
Show pop-ups the most elegant way
...
$dialog is now $modal
– Sangram Singh
Oct 10 '13 at 14:46
1
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What's “requestCode” used for on PendingIntent?
... No, It is not necessary for different intents. And I don't know why the documentation doesn't say anything about it, but I learnt this when setting repeating alarms and also when using the same intent.
– Minhaj Arfin
Feb 3 '14 at 12:46
...
The maximum value for an int type in Go
...1111 which gives us the maximum value for the unsigned integer (all ones). Now when you are talking about signed integer then first (the most significant) bit is used to store sign therefore to the signed int maximum value - we need to shift all bits to the right which gives us ^uint(0) >> 1 =...
What is the difference between a URI, a URL and a URN?
...hat URN to a URL and download the book for you.
Do any browsers actually know how to fetch documents by URN?
Not that I know of, but modern web browser do implement the data URI scheme.
Does the difference between URL and URI have anything to do with whether it is relative or absolute?
No. Bot...
Using querySelectorAll to retrieve direct children
...do "combinator rooted queries" (as John Resig called them) did not exist.
Now the :scope pseudo-class has been introduced. It is not supported on [pre-Chrominum] versions of Edge or IE, but has been supported by Safari for a few years already. Using that, your code could become:
let myDiv = getEle...
Can Selenium interact with an existing browser session?
Does anybody know if Selenium (WebDriver preferably) is able to communicate with and act through a browser that is already running before launching a Selenium Client?
...
How do I get a class instance of generic type T?
...
The link in "Pure Java solution" is broken, it is now blog.xebia.com/acessing-generic-types-at-runtime-in-java
– Nick Breen
Sep 26 '17 at 21:33
1
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How to trick an application into thinking its stdout is a terminal, not a pipe
... keep ownership of the keyboard, we want this to go to less. So I use this now and it works well: 0<&- script -qfc "git status" /dev/null | less -R . Those first few characters close stdin for this one commmand.
– Aaron McDaid
Nov 26 '14 at 13:54
...