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python - Argparse optional positional arguments?

I have a script which is meant to be used like this: usage: installer.py dir [-h] [-v] dir is a ... the dir argument, I get Error: Too few arguments. Question&Answers:os...

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jenkins pipeline - How do I get the output of a shell command executed using into a variable from Jenkinsfile (groovy)?

I have something like this on a Jenkinsfile (Groovy) and I want to record the stdout and the exit code in ... any kind of groovy code inside the Jenkinsfile? Question&Answers:os...

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git branch - Git: Find the most recent common ancestor of two branches

How to find the most recent common ancestor of two Git branches? Question&Answers:os...

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java - Should I declare Jackson's ObjectMapper as a static field?

The Jackson library's ObjectMapper class seems to be thread safe. Does this mean that I should declare my ... final ObjectMapper mapper = new ObjectMapper(); } Question&Answers:os...

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makefile - Define make variable at rule execution time

In my GNUmakefile, I would like to have a rule that uses a temporary directory. For example: out.tar: TMP ... a shell script but that seems somewhat unsightly. Question&Answers:os...

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How do I revert all local changes in Git managed project to previous state?

I have a project in which I ran git init. After several commits, I did git status which told me everything was up ... do it for me? git reset --hard HEAD Question&Answers:os...

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python - Why do some functions have underscores "__" before and after the function name?

This "underscoring" seems to occur a lot, and I was wondering if this was a requirement in the Python ... underscores, and why (__init__, for instance)? Question&Answers:os...

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Using git to get just the latest revision

I want to track a project that uses git. I don't want to clone the full repository and the full history, ... like in subversion. Is this possible in git? Question&Answers:os...

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java - When should we use Observer and Observable?

An interviewer asked me: What is Observer and Observable and when should we use them? I wasn't aware ... setChanged() and notifyObservers(message) methods for? Question&Answers:os...

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listview - Android List View Drag and Drop sort

I have a list of records in a listview that I want the user to be able to re-sort using a drag and drop ... Can anyone point me to some code for doing this? Question&Answers:os...

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javascript - Write / add data in JSON file using Node.js

I am trying to write JSON file using node from loop data, e.g.: let jsonFile = require('jsonfile'); for (i = ... ; fs.writeFile('myjsonfile.json', json); } }); Question&Answers:os...

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python - Heatmap in matplotlib with pcolor?

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c# - ValidateAntiForgeryToken purpose, explanation and example

Could you explain ValidateAntiForgeryToken purpose and show me example about ValidateAntiForgeryToken in MVC 4? I ... examples which explain this attribute? Question&Answers:os...

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no changes to deploy android studio 2.1

Android Studio 2.1 instant run is not updating the app on the device I observed an issue with AndroidStudio 2.1 ... time in order to reflect the changes in app. Question&Answers:os...

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objective c - How do you add an in-app purchase to an iOS application?

How do you add an in-app purchase to an iOS app? What are all the details and is there any sample code? This ... for how to add in-app purchases to iOS apps Question&Answers:os...

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How to git-svn clone the last n revisions from a Subversion repository?

Problem How do you create a shallow copy with git-svn from a Subversion repository, e.g. how do you pull ... /some/svn/repo . Documentation git-clone git-svn Question&Answers:os...

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bash - How to put a line comment for a multi-line command

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javascript - Reactjs setState() with a dynamic key name?

EDIT: this is a duplicate, see here I can't find any examples of using a dynamic key name when setting the ... to be updated. Is this not possible in React? Question&Answers:os...

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SVN:externals equivalent in Git?

I have two SVN projects in use from another SVN repository using svn:externals. How can I have the same repository layout structure in Git? Question&Answers:os...

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How and where are Annotations used in Java?

What are the major areas that we can use Annotations? Is the feature a replacement for XML based configuration? Question&Answers:os...

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compression - Why use deflate instead of gzip for text files served by Apache?

What advantages do either method offer for html, css and javascript files served by a LAMP server. Are ... choosing gzip over deflate for http compression? Question&Answers:os...

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javascript - The .replace() method does change the string in place

I simply try to use the .replace() method. And it does not work. HTML: <div class="try"> </div> JS: var valr='r ... to get 't' Any idea on why it doesn't work? Question&Answers:os...

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c# - Is there any benefit to this switch / pattern matching idea?

I've been looking at F# recently, and while I'm not likely to leap the fence any time soon, it definitely ... language support... here's hoping ;-p). Question&Answers:os...

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How to use git with gnome-keyring integration

Git 1.8.0 supports integration with gnome-keyring. http://www.h-online.com/open/news/item/Git-1-8-0-can- ... installed from Archlinux's repository. (git 1.8.0) Question&Answers:os...

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ios - Ineligible Devices section appeared in Xcode 6.x.x

After installing Xcode 6 my devices moved to greyed-out section Ineligible Devices and I can't select them as ... Check this solution list for more details. Question&Answers:os...

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Downloading Java JDK on Linux via wget is shown license page instead

When I try to download Java from Oracle I instead end up downloading a page telling me that I need agree to ... license. How can I download and install Java? Question&Answers:os...

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How to give ASP.NET access to a private key in a certificate in the certificate store?

I have an ASP.NET application that accesses private key in a certificate in the certificates store. On Windows Server 2003 I ... "No"; } return "Yes"; } } Question&Answers:os...

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android - Clear back stack using fragments

I ported my Android app to honeycomb and I did a big refactor in order to use fragments. In my ... having to use startActivity with the ACTIVITY_CLEAR_TOP flag? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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