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windows - What is the proper way to test if a parameter is empty in a batch file?

I need to test if a variable is set or not. I've tried several techniques but they seem to fail whenever %1 ... it's purpose is but nevertheless, I changed it. Question&Answers:os...

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

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javascript - How can I bind to the change event of a textarea in jQuery?

I want to capture if any changes happened to <textarea>. Like typing any characters (deleting,backspace) or mouse ... button if a <textarea> contains any text. Question&Answers:os...

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

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605 views

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ios - Swift add icon/image in UITextField

I would like to add icon/image in UITextField. The icon/image should be left to placeholder. I tried this ... = image; emailField.leftView = imageView; Thanks. Question&Answers:os...

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

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python - Boto3 to download all files from a S3 Bucket

I'm using boto3 to get files from s3 bucket. I need a similar functionality like aws s3 sync My current ... s3 bucket using boto3. How to download folders. Question&Answers:os...

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

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javascript - How to sort in mongoose?

I find no doc for the sort modifier. The only insight is in the unit tests: spec.lib.query.js#L12 writer.limit(5). ... me: Post.find().sort(['updatedAt', 1]); Question&Answers:os...

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

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Uses for the Java Void Reference Type?

There is a Java Void -- uppercase V-- reference type. The only situation I have ever seen it used is to ... than null? If yes, do you have examples? Question&Answers:os...

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

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hibernate - Joining two table entities in Spring Data JPA

I want to write a query like SELECT * FROM Release_date_type a LEFT JOIN cache_media b on a. ... public List<ReleaseDateType> FindAllWithDescriptionQuery(); } Question&Answers:os...

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

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c++ - understanding of pthread_cond_wait() and pthread_cond_signal()

Generally speaking, pthread_cond_wait() and pthread_cond_signal() are called as below: //thread 1: pthread_mutex_lock(&mutex) ... for the same cond-mutex pair? Question&Answers:os...

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

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c# - Automatically INotifyPropertyChanged

Is there any way to automatically get notified of property changes in a class without having to write ... t really feasible for my project either. Question&Answers:os...

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

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iOS (iPhone, iPad, iPodTouch) view real-time console log terminal

Is there a way to view the real-time console log to view NSLog and other debug messages in a real-time manner, such as adb logcat? Question&Answers:os...

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

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git - Change case of a file on Windows?

This question already has answers here: Question&Answers:os...

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

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bash - How to check if a process id (PID) exists

In a bash script, I want to do the following (in pseudo-code): if [ a process exists with $PID ... 's the appropriate expression for the conditional statement? Question&Answers:os...

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

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Which encoding opens CSV files correctly with Excel on both Mac and Windows?

We have a web app that exports CSV files containing foreign characters with UTF-8, no BOM. Both Windows and ... there any encoding that works in both worlds? Question&Answers:os...

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

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javascript - How do I generate sourcemaps when using babel and webpack?

I'm new to webpack, and I need a hand in setting up to generate sourcemaps. I'm running webpack serve from the ... 'm not sure what this problem is specific to. Question&Answers:os...

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

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formatting - How can I break up this long line in Python?

How would you go about formatting a long line such as this? I'd like to get it to no more than 80 characters ... url.format(line[indexes['url']], video.title)) Question&Answers:os...

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

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python - Convert a list with strings all to lowercase or uppercase

I have a Python list variable that contains strings. Is there a function that can convert all the strings in one pass to lowercase and vice versa, uppercase? Question&Answers:os...

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

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ruby on rails - Impossible to Install PG gem on my mac with Mavericks

I'm trying to install the pg gem in order to work again with my rails projects. But I get this error: Building ... a while... Successfully installed pg-0.17.0 Question&Answers:os...

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

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reflection - Python: changing methods and attributes at runtime

I wish to create a class in Python that I can add and remove attributes and methods. How can I acomplish that? Oh, and please don't ask why. Question&Answers:os...

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

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164 views

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What should a Multipart HTTP request with multiple files look like?

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

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Why is the Borg pattern better than the Singleton pattern in Python

Why is the Borg pattern better than the Singleton pattern? I ask because I don't see them resulting in anything ... well, and this is easier with a Singleton. Question&Answers:os...

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

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223 views

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javascript - Why escape_javascript before rendering a partial?

I'm looking at this Railscast episode and wondering why the call to escape_javascript is needed here: $("#reviews"). ... But that doesn't mean much to me. Question&Answers:os...

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

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201 views

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python - Deep-Learning Nan loss reasons

Perhaps too general a question, but can anyone explain what would cause a Convolutional Neural Network to diverge? ... layers, data size, etc is appreciated. Question&Answers:os...

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

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644 views

1 answer

reactjs - How can I persist redux state tree on refresh?

The first principle of Redux documentation is: The state of your whole application is stored in an object tree ... how developers keep their state tree! :) Question&Answers:os...

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

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75 views

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How do I create multiple model instances with Django Rest Framework?

I would like to save and update multiple instances using the Django Rest Framework with one API call. For example, ... can save it at the teacher level. Thanks! Question&Answers:os...

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

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.net - Is there a way to call a stored procedure with Dapper?

I am very impressed with the results of Dapper Micro ORM for stackoverflow.com. I am considering it for my new ... otherwise I have to extend it in my way. Question&Answers:os...

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

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674 views

1 answer

app store - If I revoke an existing distribution certificate, will it mess up anything with existing apps?

I built an iOS app for an organization that has an app already on the store. After weeks of trying to ... me, so a little clarification would be appreciated!! Question&Answers:os...

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

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135 views

1 answer

Limitations in running Ruby/Rails on windows

In the installation documentation to RoR it mentions that there are many limitations to running Ruby on Rails on Windows ... should've done it years ago </bias> Question&Answers:os...

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

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80 views

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How to use EOF to run through a text file in C?

I have a text file that has strings on each line. I want to increment a number for each line in the text file, but ... loop, but I'm not sure how to do it. Question&Answers:os...

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

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