keys

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a url that I am using in one of the controllers. Is there a better place to put this url? The url uses an API key and I was wondering if there is a better place to add this url and/or api key such that its not added in the controller class code and ergo more editable? If i add it as an environment variable or anything else how do i access it from my controller class? thank you. ITS A RUBY AND RAILS PROJECT 回答1: Using environment variables might be a good idea if you want to keep things like API keys and passwords out of your source

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I've got an unsorted array of keys like this: keys = ["ccc", "ddd", "ggg", "aaa", "bbb"] and a hash hash = {"ddd" => 4, "aaa" => 1, "bbb" => 2, "eee" => 5, "fff" => 6} I'd like to join these two data structures to return a hash in the original order of keys to the first keys: {"ccc" => nil, "ddd" => 4, "ggg" => nil, "aaa" => 1, "bbb" => 2} Items NOT in the hash (like "ggg") should return nil. This is analogous to the "v-lookup" function in excel. this is in ruby. Thanks! 回答1: Cryptic: Hash[keys.zip(hash.values_at *keys)] Or a bit longer, a

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm using this code to bind keyboard keys to custom actions without using the KeyListener : Action left = new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { System.out.println("pressed left key"); } }; Action right = new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { System.out.println("pressed right key"); } }; Action space = new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { System.out.println("pressed space key"); } }; myJPanel.getInputMap().put(KeyStroke

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have written a full selenium script that's working but not all the time as whem I try to select meals (this is last sections of the page), I sometimes get two errors. One error is a timeout exception as it waits for a meal drop down to have an option selected, wait for it to be clickable again after it loads its selected option before moving onto the next option. I assume for this I need to set the wait = WebDriverWait(driver, 20) to longer than 20 seconds just in case the drop down options are taking longer to load. Another issue I am

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I'm making a game using canvas, and javascript. When the page is longer than the screen (comments, etc.) pressing the down arrow scrolls the page down, and makes the game impossible to play. What can I do to prevent the window from scrolling when the player just wants to move down? I guess with Java games, and such, this is not a problem, as long as the user clicks on the game. I tried the solution from: How to disable page scrolling in FF with arrow keys ,but I couldn't get it to work. 回答1: Summary Simply prevent the default browser action:

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: My goal is to remove from the raw stack the records that are not in the good keys list. How do I achieve this in the most efficient manner? The code I'm currently working on feels dragging. I'm open for suggestions. Please do note that the values could get ridiculously large. Here's my data: # Main data container my %raw_stack = ( 'a1~a2~a3' => 'dat1~dat2', 'b1~b2~b3' => 'dat1~dat2', 'c1~c2~c3' => 'dat1~dat2', 'd1~d2~d3' => 'dat1~dat2', 'e1~e2~e3' => 'dat1~dat2', ); # Container of stack keys only my @stack_keys = ( 'a1~a2~a3', 'b1~b2~b3',

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: My database design is currently at stage 3NF. The issue that is of concern is the foreign keys and in some cases compound keys. My question is this: Can you move compound keys and/or foreign keys to create other tables provided the attributes associated with the compound keys/foreign keys do not rely on the primary key? I think the answer is yes due to this link: Are Foreign Keys included in Third Normal Form? Best Answer : Just because it's a foreign key doesn't mean it also can't be considered an attribute of the primary key. The fact that

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a list as follows ['item1', 'item2', 'item3', 'item4'] I want to construct a dictionary from the above list as follows { "item1": { "item2": { "item3": "item4" } } } The number of items in the list is dynamic. The dictionary will be a nested dictionary till it reaches the last element of the list. Is there any way in python to do this? 回答1: Simple one-liner: a = ['item1', 'item2', 'item3','item4'] print reduce(lambda x, y: {y: x}, reversed(a)) For better understanding the above code can be expanded to: def nest_me(x, y): """ Take two

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: Lets have a following dict: table = {x1: {y1: 1, y2:2}, x2: {y1: 3, y2:4}, x3: {y3: 5, y2:6} } Considering the values are unique, is there any way to query the key path based on the value efficiently or it is better to reconstruct the dict using the value as the key? Example: result = magic_function(table, 3) result --> [x2, y1] Thanks, 回答1: The idiomatic way to "invert" a dictionary is like this: i = {v: k for (k, v) in d.items()} If you're in Python 2 rather than 3, and d might be big, use iteritems instead. In your case, you've got a dict

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I was trying shortest path finder using dijkstra algorithm but It seems not working. Can't figure out what the problem is. Here are the code and the error message. (I'm working on Python 3.5. https://www.youtube.com/watch?v=LHCVNtxb4ss ) graph = { 'A': {'B': 10, 'D': 4, 'F': 10}, 'B': {'E': 5, 'J': 10, 'I': 17}, 'C': {'A': 4, 'D': 10, 'E': 16}, 'D': {'F': 12, 'G': 21}, 'E': {'G': 4}, 'F': {'E': 3}, 'G': {'J': 3}, 'H': {'G': 3, 'J': 3}, 'I': {}, 'J': {'I': 8}, } def dijkstra(graph, start, end): D = {} P = {} for node in graph.keys(): D[node]=