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Why does Python have an __ne__ operator method instead of just __eq__?

The answer here gives a handwaving reference to cases where you'd want __ne__ to return something other than just the ... does-python-have-an-ne-operator-method-instead-of-just-eq...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - When is a function try block useful?

I'm wondering when programmers use function try blocks. When is it useful? void f(int i) try { if ( i ... //stackoverflow.com/questions/5612486/when-is-a-function-try-block-useful...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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sql - How to hint the index to use in a MySQL select query?

I have a MySQL query (running MySQL 5.0.88), which I'm trying to speed up. The underlying table has multiple indices ... /how-to-hint-the-index-to-use-in-a-mysql-select-query...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - How to hide the border for specified rows of a table?

I want to hide the border for a specific rows of a table.How to do it? Any Idea? Sample code is Highly ... /11517432/how-to-hide-the-border-for-specified-rows-of-a-table...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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MySql - Is primary key unique by default?

If I define a column as a primary key in MySql, is it also unique key by default or do I need to ... ://stackoverflow.com/questions/30911898/mysql-is-primary-key-unique-by-default...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the difference between <E extends Number> and <Number>?

What is the difference between this method declaration: public static <E extends Number> List<E> process(List<E> ... /what-is-the-difference-between-e-extends-number-and-number...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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gitosis - git Warning: remote HEAD refers to nonexistent ref, unable to checkout

I'm trying to setup gitosis according to the instructions here. It works fine from my remote machine so the ... -warning-remote-head-refers-to-nonexistent-ref-unable-to-checkout...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Change language of system and error messages in PostgreSQL

Is it possible to change the language of system messages from PostgreSQL? In MSSQL for instance this is ... 191428/change-language-of-system-and-error-messages-in-postgresql...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Eigen how to concatenate matrix along a specific dimension?

I have two eigen matrices and I would like to concatenate them, like in matlab cat(0, A, B) Is ... /questions/21496157/eigen-how-to-concatenate-matrix-along-a-specific-dimension...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Java Fastest way to read through text file with 2 million lines

Currently I am using scanner/filereader and using while hasnextline. I think this method is not highly efficient. Is there ... -way-to-read-through-text-file-with-2-million-lines...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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css - Force HTML Tables To Not Exceed Their Containers' Size

This question has been asked several times, but none of the answers provided seem to help me: See this in ... /17969877/force-html-tables-to-not-exceed-their-containers-size...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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hook - How to specify which SSH key to use within git for git push in order to have gitorious as a mirror?

I have a project hosted on git.debian.org (alioth) and I'd like to configure a post-receive hook to update a mirror of ... -key-to-use-within-git-for-git-push-in-order-to-have-git...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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angular - How to convert Observable<any> to array[]

I have following method in typescript, I need to bind to angular grid CountryService GetCountries() { return ... .com/questions/44940695/how-to-convert-observableany-to-array...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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NPM Cannot read property '0' of undefined

After updated Node (upto v8.6.0) and npm (upto v5.5.1) I cannot execute command npm install. After ... /stackoverflow.com/questions/46619949/npm-cannot-read-property-0-of-undefined...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Eigen how to concatenate matrix along a specific dimension?

I have two eigen matrices and I would like to concatenate them, like in matlab cat(0, A, B) Is ... /questions/21496157/eigen-how-to-concatenate-matrix-along-a-specific-dimension...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to solve two packages requirements conflicts when running composer install?

I want to install these two packages: "anahkiasen/former": "dev-master" "vespakoen/menu": "dev-master ... to-solve-two-packages-requirements-conflicts-when-running-composer-install...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How to get the size of a Winforms Form titlebar height?

So if it's toolwindow or a minimizable form, I want to be able to get its height programmatically. Is this possible ... /how-to-get-the-size-of-a-winforms-form-titlebar-height...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to initialize const members of structs on the heap

I would like to allocate a structure on the heap, initialize it and return a pointer to it from a function. I ... /2219001/how-to-initialize-const-members-of-structs-on-the-heap...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - AlamoFire Download in Background Session

I am using Alamofire within a new app (A Download Manager Sample based on Alamofire) I need some ... //stackoverflow.com/questions/30134652/alamofire-download-in-background-session...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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xcode5 - Use of xcassets

Is .xcassets resource only for app icons and launch images or for our own image assets also? I do know ... from:https://stackoverflow.com/questions/19441935/use-of-xcassets...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Is it possible to transform a value between view and model in AngularJS for input?

New to AngularJS. Trying to figure out how I would accomplish this, or if it is possible at all. I know I can ... -to-transform-a-value-between-view-and-model-in-angularjs-for-inpu...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What is the difference between Python vs Jython vs IronPython vs wxPython?

I am quite new in Python programming. While googling I found some of the Python related words. I just wanted ... -the-difference-between-python-vs-jython-vs-ironpython-vs-wxpython...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Loop over Object attributes in Ruby on Rails

Is it possible to loop over an object's attributes in Rails? I have an object and rather than code up each ... .com/questions/6085661/loop-over-object-attributes-in-ruby-on-rails...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ruby - Rails article helper - "a" or "an"

Does anyone know of a Rails Helper which can automatically prepend the appropriate article to a given string? ... stackoverflow.com/questions/5381738/rails-article-helper-a-or-an...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Sorting a dictionary by value then by key

(This question already has answers here): question from:https://stackoverflow.com/questions/7742752/sorting-a-dictionary-by-value-then-by-key...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to overwrite array inside h5 file using h5py

I'm trying to overwrite a numpy array that's a small part of a pretty complicated h5 file. I'm extracting ... /questions/22922584/how-to-overwrite-array-inside-h5-file-using-h5py...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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hash - Is there a limit for sha256 input?

When hashing a string, like a password, with sha256, is there a limit to the length of the string I am ... //stackoverflow.com/questions/17388177/is-there-a-limit-for-sha256-input...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Jquery submit form

(This question already has answers here): question from:https://stackoverflow.com/questions/3752134/jquery-submit-form...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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