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Display help message with python argparse when script is called without any arguments

This might be a simple one. Assume I have a program that uses argparse to process command line arguments/options. ... . How is that done? See Question&Answers more detail:os...

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

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iphone - Xcode 4 hangs at "Attaching to (app name)"

I just upgraded to Xcode 4 and for some reason my app won't run in the simulator or iOS device. It was ... as a group the problem went away. See Question&Answers more detail:os...

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

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security - How to remove ASP.Net MVC Default HTTP Headers?

Each page in an MVC application I'm working with sets these HTTP headers in responses: X-Powered-By: ASP.NET ... I prevent these from showing? See Question&Answers more detail:os...

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

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java - ConnectionTimeout versus SocketTimeout

I'm having a problem with a library that I am using. It might be the library or it might be me using ... is here (not officially released yet). See Question&Answers more detail:os...

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

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How to make EditText not editable through XML in Android?

Can anyone tell me how to make an EditText not editable via XML? I tried setting android:editable to false, but it ... ; and it didn't work. See Question&Answers more detail:os...

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

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Android: how to draw a border to a LinearLayout

I have three files. The XML, the draw function and the main Activity. I have some LinearLayout in my XML ... figure out the center coordinates? See Question&Answers more detail:os...

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html - How can I show dots ("...") in a span with hidden overflow?

My CSS: #content_right_head span { display:inline-block; width:180px; overflow:hidden !important; } Now it ... coming dynamically from database. See Question&Answers more detail:os...

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objective c - Set a custom subclass of UINavigationBar in UINavigationController programmatically

Does anyone know how can I use my custom subclass of UINavigationBar if I instantiate UINavigationController ... done also programmatically. See Question&Answers more detail:os...

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string - Shell script - remove first and last quote (") from a variable

Below is the snippet of a shell script from a larger script. It removes the quotes from the string that is held by a ... /(.*)./1/'` echo $temp See Question&Answers more detail:os...

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SQL Server loop - how do I loop through a set of records

how do I loop through a set of records from a select? So say for example I have a few records that I ... dbo.table where StatusID = 7 Thanks See Question&Answers more detail:os...

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opengl - How to debug a GLSL shader?

I need to debug a GLSL program but I don't know how to output intermediate result. Is it possible to make ... (like with printf) with GLSL ? See Question&Answers more detail:os...

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'typeid' versus 'typeof' in C++

I am wondering what the difference is between typeid and typeof in C++. Here's what I know: typeid ... i 6Person 8Employee P6Person 8Employee See Question&Answers more detail:os...

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java - What is the difference between PermGen and Metaspace?

Until Java 7 there was an area in JVM memory called PermGen, where JVM used to keep its classes. In ... VM parameter MaxPermSize is ignored. See Question&Answers more detail:os...

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

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c# - Command dotnet ef not found in .NET Core 3

I'm following the docs in order to create an initial migration. When I execute dotnet, I get the help section ... EntityFrameworkCore (>= 2.2.6) See Question&Answers more detail:os...

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

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javascript - After installation of Gulp: “no command 'gulp' found”

After installing gulp.js via npm, I receive a no command 'gulp' found error when running the gulp command ... wrong with my npm installation? See Question&Answers more detail:os...

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bash - How do I make this file.sh executable via double click?

First off I'm using Mac. Next, I need to execute this "file.sh" we will call it. Everytime I need to execute ... , I'm new to Terminal. Thanks. See Question&Answers more detail:os...

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css - rotate3d shorthand

How to combine rotateX(50deg) rotateY(20deg) rotateZ(15deg) in shorthand rotate3d()? See Question&Answers more detail:os...

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java - Any shortcut to initialize all array elements to zero?

In C/C++ I used to do int arr[10] = {0}; ...to initialize all my array elements to 0. Is there a similar shortcut in ... ; i++) { arr[i] = 0; } See Question&Answers more detail:os...

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shell - Finding most changed files in Git

How can I show files in Git which change most often? See Question&Answers more detail:os...

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WCF Service , how to increase the timeout?

Might seem like a silly question, but everything in WCF seems a lot more complicated than in asmx, how can ... > </basicHttpBinding> </bindings> See Question&Answers more detail:os...

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

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Logical XOR operator in C++?

Is there such a thing? It is the first time I encountered a practical need for it, but I don't see one ... bool XOR(bool,bool) function instead. See Question&Answers more detail:os...

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amazon s3 - Is there an S3 policy for limiting access to only see/access one bucket?

I have a simple bucket that looks like images.mysite.com on my S3 and other buckets containing backups, etc. I ... the listing of any buckets. See Question&Answers more detail:os...

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iphone - Best way to implement Enums with Core Data

What is the best way to bind Core Data entities to enum values so that I am able to assign a type property to ... best way of going about this. See Question&Answers more detail:os...

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ssl - How to get charles proxy work with Android 7 nougat?

Android 7 introduced some changes to the way certificates are handled (http://android-developers.blogspot.com/2016/07/ ... I am doing wrong ? See Question&Answers more detail:os...

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github - Trying to git pull with error: cannot open .git/FETCH_HEAD: Permission denied

Help me please, I am trying to run this in my terminal: asgard@asgard-A7N8X2-0:~/CollegePortal$ git pull ... don't understand this problem. See Question&Answers more detail:os...

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

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Python pandas Filtering out nan from a data selection of a column of strings

Without using groupby how would I filter out data without NaN? Let say I have a matrix where customers will ... does not work with strings. See Question&Answers more detail:os...

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performance - Has anyone actually implemented a Fibonacci-Heap efficiently?

Has anyone of you ever implemented a Fibonacci-Heap? I did so a few years back, but it was several ... some details would be appreciated. See Question&Answers more detail:os...

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winapi - What's the differences between VirtualAlloc and HeapAlloc?

There are lots of method to allocate memory in Windows environment, such as VirtualAlloc, HeapAlloc, malloc, new ... the difference among them? See Question&Answers more detail:os...

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

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