built-in

What is typically regarded as more Pythonic/better/faster to use, the reverse method or the reversed built-in function? Both in action: _list = list(xrange(4)) print _list rlist = list(reversed(_list)) print rlist _list.reverse() print _list Depends on whether you want to reverse the list in-place (i.e. change the list) or not. No other real difference. Often using reversed leads to nicer code. foo.reverse() actually reverses the elements in the container. reversed() doesn't actually reverse anything, it merely returns an object that can be used to iterate over the container's elements in

Are there any self-balancing binary search tree ( RED-BLACK , AVL or others) built-in types in Python 2.7 or Python 3.x? I am looking for something equivalent to Java's TreeMap or TreeSet . If there are no such built-ins, why have they been ommited? Is there a special reason, for not including such tools? There's no special reason, to my knowledge - I'd guess that the reason is that for so many applications the highly-tuned dict and set implementations (which are hash tables) work well. They're good enough in most cases. There are definitely situations where you need the performance

Is there any built-in function to replace an element at a given index in haskell? Example: replaceAtIndex(2,"foo",["bar","bar","bar"]) Should give: ["bar", "bar", "foo"] I know i could make my own function, but it just seems it should be built-in. hammar If you need to update elements at a specific index, lists aren't the most efficient data structure for that. You might want to consider using Seq from Data.Sequence instead, in which case the function you're looking for is update :: Int -> a -> Seq a -> Seq a . > import Data.Sequence > update 2 "foo" $ fromList ["bar", "bar", "bar"] fromList [

I'm trying to convert my .py script into an executable using py2exe. I've had a number of issues so far that have been largely addressed by the "options" in the setup file below. But now I have a problem that I have not been able to find a solution for, and wondering if others have had this same issue and fixed it. When I execute the setup file below using "python setup.py py2exe" it gives me an executable but when I run it, it complains "No module named builtins". The only other post I could find on this subject indicated that builtins is a python3 thing, but I'm running 2.7. Appreciate any

I am trying to become more familiar with the itertools module and have found a function called ifilter . From what I understand, it filters and iterable based on the given function and returns an iterator over a list containing the elements of the iterable on which the function evaluates to True . Question 1 : is my understanding thus far correct? Question 2 : aside from the fact that this returns and iterator, how is it different from the built-in filter function? Question 3 Which is faster? From what I can tell, it is not. Am I missing something? (I ran the following test) >>> itertools

Each time I use pushd or popd, it print the stack to standard output. How not to do so? I don't want to do pushd > /dev/null each time because I have a lot of scripts calling each other. Maybe a nice override will do it, but I'll need to override these builtins only in my scripts, and then restore the correct behavior. You could add pushd () { command pushd "$@" > /dev/null } popd () { command popd "$@" > /dev/null } to the top of each script. This is probably the minimum amount of work it will take to solve your problem. In your .profile file (what ever it is called in your system) add: pushd

How to find a value exist in an array and how to remove it. If any php builtin array functions for doing this. After removing I need the sequential index order. any body knows please help me. To search an element in an array, you can use array_search function and to remove an element from an array you can use unset function. Ex: <?php $hackers = array ('Alan Kay', 'Peter Norvig', 'Linus Trovalds', 'Larry Page'); print_r($hackers); // Search $pos = array_search('Linus Trovalds', $hackers); echo 'Linus Trovalds found at: ' . $pos; // Remove from array unset($hackers[$pos]); print_r($hackers); ?>