keyword

问题 I am currently using Python3 in Jupyter Notebook and I just ran into a keyword exit . What does this keyword do ? with open("some_file.txt") as f: for lines in f: print(lines) exit 回答1: The exit lines in your loop do nothing. Why they do nothing is a bit more complicated than the usual reason exit would do nothing in Python, though. Normally, exit on a line by its own wouldn't exit Python. At most, in interactive mode, it would print a message telling you how to quit Python (message

问题 I was reading some online material on reserved JavaScript keywords and I came across the word package . I couldn't find any clear online material that could explain what it is useful for. 回答1: It is reserved, but not necessarily used (well, not at least of time of writing). The following are reserved as future keywords by the ECMAScript specification. They have no special functionality at present, but they might at some future time, so they cannot be used as identifiers. (Note that for the

问题 What functionality does the stackalloc keyword provide? When and Why would I want to use it? 回答1: From MSDN: Used in an unsafe code context to allocate a block of memory on the stack. One of the main features of C# is that you do not normally need to access memory directly, as you would do in C/C++ using malloc or new . However, if you really want to explicitly allocate some memory you can, but C# considers this "unsafe", so you can only do it if you compile with the unsafe setting.

问题 I am using UserDictionary.Words class's addWord function to add Words to Dictionary so that they can show up in Text prediction. The Words do exist in the dictionary with APP_ID=0 and available for default android keyboard. However I am using Swift keyboard and it is not considering those words for Prediction. I am using this TUTORIAL UserDictionary.Words.addWord(this, "ThisIsSomeWordIwantForPrediction", 250, null, Locale.getDefault()); My question is how can I add words such that they are

问题 Hye..I managed to create search function to search using multiple keywords. The problem is the keywords must be exist inside my database column that i had set. If i search using 3 keywords which is 2 keywords match inside database but 1 more keyword is not exist. The result was displayed nothing. How could I ignore the non existing keywords?? just take the keywords that exists inside my database only. Means, if the user enter many keywords, system will read only keywords that match inside my

问题 Hye..I managed to create search function to search using multiple keywords. The problem is the keywords must be exist inside my database column that i had set. If i search using 3 keywords which is 2 keywords match inside database but 1 more keyword is not exist. The result was displayed nothing. How could I ignore the non existing keywords?? just take the keywords that exists inside my database only. Means, if the user enter many keywords, system will read only keywords that match inside my

问题 This question already exists : PHP KEYWORD SEARCH ENGINE NO RESULTS [duplicate] Closed 3 years ago . I have a simple MySQL database keyword search that is functional. However results for the search are not being returned if the keywords are not in the same order as entered in the database. For example searching for "dog cat lion" will return a result, but searching for "dog lion cat" will return no results. Any help on how to fix this issue would be greatly appreciated. Here is my code. <

问题 What are the benefits of using with() ? In the help file it mentions it evaluates the expression in an environment it creates from the data. What are the benefits of this? Is it faster to create an environment and evaluate it in there as opposed to just evaluating it in the global environment? Or is there something else I'm missing? 回答1: with is a wrapper for functions with no data argument There are many functions that work on data frames and take a data argument so that you don't need to

问题 I found a strange keyword in NSObject.h - (oneway void)release; I searched the web, and learned it relates to asynchronous message passing, which looks similar with Erlang's message passing. It seems this can make many interesting things. What are some good use-cases of this keyword? 回答1: oneway is used with the distributed objects API, which allows use of objective-c objects between different threads or applications. It tells the system that it should not block the calling thread until the

问题 I am trying to write a Lisp function that can take optional and keyword arguments. The function begins (defun max-min (v &optional max min &keyword (start 0) (end nil)) When I try to call the function using the keyword arguments but not the optional ones, I get an error. What I'm trying to do is (max-min #(1 2 3 4) :start 1 :end 2) I'm getting the error Error: :START' is not of the expected type REAL' I assume that this is because it is trying to bind :start to max . How can I get this to