keyword

问题 Are there any other uses for Python's "from" keyword aside from import statements? 回答1: No and yes. According to the official Python 2.7.2 grammar, the only occurrence of the word from is in the clause import_from , so no. In the Python 3.1.3 grammar a new clause raise_stmt: 'raise' [test ['from' test]] appears, so yes. 回答2: In Python 2.x, the only use of from is for the from x import y statement. However, for Python 3.x, it can be used in conjunction with the raise statement, e.g.: try:

问题 Are there any other uses for Python's "from" keyword aside from import statements? 回答1: No and yes. According to the official Python 2.7.2 grammar, the only occurrence of the word from is in the clause import_from , so no. In the Python 3.1.3 grammar a new clause raise_stmt: 'raise' [test ['from' test]] appears, so yes. 回答2: In Python 2.x, the only use of from is for the from x import y statement. However, for Python 3.x, it can be used in conjunction with the raise statement, e.g.: try:

问题 This question already has answers here : How to emulate C# as-operator in Java (6 answers) Closed 5 years ago . As we know C# provides an AS keyword which automatically performs a check whether the Object is of a type and if it is, it then casts it to the needed type else gives a null. public class User { } .... Object obj = someObj; User user = obj As User; ... Here in the above example, An Object obj can be of type User or some other type. The user will either get an object of type User or

问题 I have a large PDF that has been combined from multiple documents. How can I split the PDF back into multiple documents with a keyword delimiter? 回答1: As well as Adobe Reader you will need Adobe Acrobat. Add the following script using the Action Wizard: Paste in the following script and modify for your needs. See //comments for help on customisation. /* Extract Pages into Documents by Keyword */ // Iterates over all pages and find a given string and extracts all // pages on which that string

问题 There are a lot of questions at this site with the problems while compiling c++ template code. One of the most common solutions to such problems is to add typename (and, less frequently, template ) keyword in the right places of the program code: template<typename T> class Base { public: typedef char SomeType; template<typename U> void SomeMethod(SomeType& v) { // ... } }; template<typename T> class Derived : public Base<T> { public: void Method() { typename Base<T>::SomeType x; // ^^^^^^^^

问题 I was reading an SQL tutorial which used the keyword EXPLAIN to see how a query is executed. I tried it in SQL Server 2008 with no success. How do I get the equivalent result? 回答1: I believe that the EXPLAIN keyword is an MySQL concept - the equivalent Microsoft SQL server concept is the execution plan. The simplest way of getting an execution plan is to turn on the "Show actual execution plan" menu item (in the query menu) in SQL server management studio. Alternatively you can read a more in

问题 I heard about a "yield" keyword in JavaScript, but I found very poor documentation about it. Can someone explain me (or recommend a site that explains) its usage and what it is used for? 回答1: The MDN documentation is pretty good, IMO. The function containing the yield keyword is a generator. When you call it, its formal parameters are bound to actual arguments, but its body isn't actually evaluated. Instead, a generator-iterator is returned. Each call to the generator-iterator's next() method

问题 I am trying to write a indexeddb function "delete". It should read like this in JS: var transaction = db.transaction('objectStore','readwrite'); var objectStore = transaction.objectStore('objectStore'); objectStore.delete(id); However, when I write it in CS: transaction = db.transaction 'objectStore','readWrite' objectStore = transaction.objectStore 'objectStore' objectStore.delete(id) Of course it outputs: ... objectStore["delete"](id); I didn't write a method for IDBTransaction called

问题 I have a long list of key words/phrases that I want to search for in Web of Science to get counts of articles (X articles used "term a"). Ideally, the search would look at the titles, abstracts, keywords, and power keywords (this is what Web of Science searches). Ideally I could also specify specific years to search, although that's not imperative. I am trying to find a way to do that using R OR Python instead of having to keep changing the entries and clicking back and forth. Even if it

问题 From the script here I see how to set document keywords with the coreproperties function of python-docx. I want to look at the keywords already in a document written by someone else. Is there a getcoreproperties function or a keywords attribute or something similar? I've grepped in folder C:\Python27\Lib\site-packages\python_docx-0.5.0-py2.7.egg\docx and none of the .py files there have the string "core" in them, and I've called doc() on a few things but without finding anything promising.