reverse

问题 Greetings, I am changing the width of an element which serves as a bar , and that works. However I can't make it so that it animates it in the opposite direction. I tried putting - in front of bar_width but to no avail. Width will be dynamically calculated it's just that I want the direction to go to the left rather than to the right like so <------- not -----------> var bar_width=$(this).css('width') ; $(this).css('width', '0').animate({ width: bar_width }, queue:false,duration:3500,easing:

问题 This question already has answers here : How to read lines from a file in python starting from the end (5 answers) Closed 5 years ago . I am parsing log files in size of 1 to 10GB using python3.2, need to search for line with specific regex (some kind of timestamp), and I want to find the last occurance. I have tried to use: for line in reversed(list(open("filename"))) which resulted in very bad performance (in the good cases) and MemoryError in the bad cases. In thread: Read a file in

问题 I have a List<T> that I want to be able to copy to an array backwards, meaning start from List.Count and copy maybe 5 items starting at the end of the list and working its way backwards. I could do this with a simple reverse for loop; however there is probably a faster/more efficient way of doing this so I thought I should ask. Can I use Array.Copy somehow? Originally I was using a Queue as that pops it off in the correct order I need, but I now need to pop off multiple items at once into an

问题 What is the best way to alternate the direction of a CSS3 animation on click without javascript? I've been exploring checkbox hacks lately and trying to figure out a way to have only one set of keyframes instead of two sets for one going forward and one to come back. Is this possible? Or is there a way to do it with one set? For instance I have the following keyframes: @keyframes moveIt { 0% { transform: translateX(0); width: $size; } 50% { width: $size*1.2; } 100% { transform: translateX

问题 I need some explanation into the unexpected result of the code below, seemingly, due to some bug. reverse' :: [b] -> [b] reverse' [] = [] reverse' [x] = [x] reverse'(x:xs) = last (x:xs) : reverse' xs *Main> reverse' [0,8,2,5,6,1,20,99,91,1] [1,1,1,1,1,1,1,1,1,1] Is this because of some bug? 回答1: When you get a totally unexpected result, especially with relatively simple function like this, it can be helpful to follow the logic through by hand. So let's see what happens here: reverse' (0:[8,2

问题 I've got a pandas DataFrame with a boolean column sorted by another column and need to calculate reverse cumulative sum of the boolean column, that is, amount of true values from current row to bottom. Example In [13]: df = pd.DataFrame({'A': [True] * 3 + [False] * 5, 'B': np.random.rand(8) }) In [15]: df = df.sort_values('B') In [16]: df Out[16]: A B 6 False 0.037710 2 True 0.315414 4 False 0.332480 7 False 0.445505 3 False 0.580156 1 True 0.741551 5 False 0.796944 0 True 0.817563 I need

问题 How do you reverse a Python string without omitting the start and end slice arguments? word = "hello" reversed_word = word[::-1] I understand that this works, but how would I get the result by specifying the start and end indexes? word = "hello" reversed_word = word[?:?:-1] It's hard to explain to students why word[::-1] reverses a string. It's better if I can give them logical reasoning rather than "it's the pythonic way". The way I explain word[::1] is as follows: "You have not specified

问题 I have a table that has IDs and Strings and I need to be able to properly index for searching for the end of the strings. How we are currently handling it is copying the information into another table and reversing each string and indexing it normally. What I would like to do is use some kind of index that allows to search in reverse. Example Data: F7421kFSD1234 d7421kFSD1235 F7541kFSD1236 d7421kFSD1234 F7421kFSD1235 b8765kFSD1235 d7421kFSD1234 The way our users usually input thier search is

问题 Thank you for taking the time to read this and I will appreciate every single response no mater the quality of content. :) Using PHP, I'm trying to get the last 15 lines of a text document (.txt) and store that data into a php variable. I understand that this is possible, however when I do get the last 15 lines, is it possible to retain the order? For example: text document: A B C When I grab the text document from the last 15 characters, I don't want the echo to end up like: C B A All

问题 I tried to learn "Lena's reversing for newbies", when some trouble arise. I start Pixtopian Book with ollyDbg, then try to have MessageBox with message about uregistered version. Then i switch to OllyDbg, stop program executing and press "Alt+F9" for "Back to user mode" which stop the program after it exit from DLL. But after this program does not work, it's frozen and does not respond to my actions. If i turn off "Back to user mode" program normally work. What's the problem? Can i try to use