coding-style

问题 Is it possible to have a two-line element in a cell (QTableWidgetItem) of a QTableWidget with different styles per line? I want to have the first line bold and the second line not bold. Or can I add two QTableWidgetItems in one cell? Do a cellspan somehow? Cheers Matthias 回答1: Simple way : Checkout the setCellWidget method of QTableWidget. If you replace the default widget with QTextEdit, you can get rich text formatting capability. Better way : Use a custom QStyledItemDelegate. You can see

问题 in openCV I regularly use cv::Mat for almost everything. Now, I need to use emgu CV and use the Matrix -object in stat, but some functions are not supported?!... may I use the image -class instead? When to use image and when to use matrix in emgu CV? P.S.: Currently I'm looking for a way to define a ROI on a matrix but didn't find a way without copying the data. Version: Emgu.CV-2.4.2 回答1: I know that in the latest version of OpenCV, the Mat object is prefered to iplImage for a lot of reasons

问题 I was just reading a presentation on python and I noted that the author had missed out the round brackets of the tuple for the items to iterate over, and it struck me that I might be inclined to leave them in. A quick re-read of PEP-8 gave no definitive answer, and I didn't want to 'fall-back' on the old "explicit is better than implicit" without some discussion; so ... Which do you prefer? Which do you think is more pythonic in these two equivalent for statements (limit the discussion to its

问题 There are clang-format etc to ensure a consistent coding style for .cpp and .h files among different developers. But how can I ensure consistent coding style in CMake for CMakeLists.txt and FindXXX.cmake written from different developers? The main rules I want to enforce is consistent indention/space, upper/lower case consistency, 80 character per line constraint 回答1: Turning my comments into an answer I don't know of a way to enforce CMakeLists.txt or other CMake script file's coding style

问题 I made a git hook that checks my code style before commit. It passes the staged files to CodeSniffer. I use the PSR-2 code style which means newlines should be \n even on Windows. However even after changing PhpStorm settings and git settings it still gives me the error that the newlines are \r\n . Why does this happen? PhpStorm Searching for \r\n with regex on does not return instances, so I believe the problem to lie with git. .gitconfig [core] autocrlf = false editor = \"C:/Program Files

问题 I have a function which takes optional parameters. However, these are not Option[?] but can be either set or null: private def div(id: String = null, cssClass: String = null): JQuery = { val optId = Option(id) val optCssClass = Option(cssClass) ... // deal with optId and optCssClass using the Scala-way™ ... } I am using "null", which I know should be avoided like the plague. However, it allows me to write code like this: div(id = "someId") // no cssClass div(id = "otherId", cssClass =

问题 I am looking for a way to explain that it's unreasonable to sprinkle high-level business logic with calls to ReferenceEquals(). Here's a code snippet that I have a problem with (precondition in a method, designed to throw if we're on a wrong thread): if (!object.ReferenceEquals(Thread.CurrentThread, RequestHandlerThread)) Is it reliable to write this instead: if (Thread.CurrentThread != RequestHandlerThread) I suggested to use ManagedThreadIds in the comparison based on what I commonly see in

问题 Whats the best way to initialize instance variables in an init function. Is it poor style to use the same name twice? class Complex: def __init__(self, real, imag): self.real = real self.imag = imag It looks sloppy to me to come up with arbitrary alternative names like this: class Complex: def __init__(self, realpart, imagpart): self.r = realpart self.i = imagpart I don't think that this is addressed in the PEP 8 style guide. It just says that the instance variable and method names should be

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I used to use prefix underscore for instance variable naming, to distinguish from local variables. I happend to see the "Google

问题 Which of the following should I use and why? import numpy as np a = np.zeros([2, 3]) b = np.zeros((2, 3)) There are many cases where you can pass arguments in either way, I just wonder if one is more Pythonic or if there are other reasons where one should be preferred over the other. I looked at this question where people tried to explain the difference between a tuple and a list. That's not what I'm interested in, unless there are reasons I should care which I ignore of course! UPDATE: