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python - Microsoft Visual C++ 14.0 is required (Unable to find vcvarsall.bat)

I've installed Python 3.5 and while running pip install mysql-python it gives me the following error error ... and installing the modules correctly via pip. Question&Answers:os...

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r - Drop unused factor levels in a subsetted data frame

I have a data frame containing a factor. When I create a subset of this dataframe using subset or another indexing function, a new ... ] "a" "b" "c" "d" "e" Question&Answers:os...

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html - Is putting a div inside an anchor ever correct?

I've heard that putting a block element inside a inline element is a HTML sin: <a href="http://example. ... Does anyone have any further tips about this issue? Question&Answers:os...

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In C, what is the difference between using ++i and i++, and which should be used in the incrementation block of a for loop? Question&Answers:os...

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hash - Is it possible to decrypt MD5 hashes?

Someone told me that he has seen software systems that: retrieve MD5 encrypted passwords from other systems; ... but is there an actual decryption algorithm? Question&Answers:os...

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regex - JavaScript + Unicode regexes

How can I use Unicode-aware regular expressions in JavaScript? For example, there should be something akin to w that can ... like [[P*]] for punctuation, etc. Question&Answers:os...

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webpack - Javascript object bracket notation ({ Navigation } =) on left side of assign

I haven't seen this syntax before and am wondering what it's all about. var { Navigation } = require('react ... Is it a Harmony thing? Can someone enlighten me? Question&Answers:os...

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r - Remove rows with all or some NAs (missing values) in data.frame

I'd like to remove the lines in this data frame that: a) contain NAs across all columns. Below is my example data ... NA NA 1 2 6 ENSG00000221312 0 1 2 3 2 Question&Answers:os...

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javascript - Selecting text in an element (akin to highlighting with your mouse)

I would like to have users click a link, then it selects the HTML text in another element (not an input). ... (); } Am I missing something blatantly obvious? Question&Answers:os...

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Using different delimiters in sed commands and range addresses

I am using sed in a shell script to edit filesystem path names. Suppose I want to replace /foo/bar with /baz/qux However, ... 'ar/,/baz/qux/d' What can I do? Question&Answers:os...

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css - Bootstrap align navbar items to the right

How do I align a navbar item to right? I want to have the login and register to the right. But everything I try does ... </ul> </nav> @yield('content') </div> Question&Answers:os...

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bash - A variable modified inside a while loop is not remembered

In the following program, if I set the variable $foo to the value 1 inside the first if statement, it works in the ... 4.1.10(4)-release (i686-pc-cygwin) Question&Answers:os...

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javascript - Unable to access React instance (this) inside event handler

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java - Applying MVC With JavaFx

I'm new to the GUI world/OO design pattern and I want to use MVC pattern for my GUI application, I have ... should it be stored in the Controller or the Model? Question&Answers:os...

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floating point - Retain precision with double in Java

public class doublePrecision { public static void main(String[] args) { double total = 0; total += 5.6; total += 5.8; ... print (or be able to use it as) 11.4? Question&Answers:os...

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How to navigate in JSF? How to make URL reflect current page (and not previous one)

I am currently learning JSF and was rather amazed and puzzled when I realized that whenever we use <h: ... entire application to treat all requests this way? Question&Answers:os...

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java - How to launch an Activity from another Application in Android

I want to launch an installed package from my Android application. I assume that it is possible using intents, but ... a link, where to find the information? Question&Answers:os...

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MongoDB relationships: embed or reference?

I'm new to MongoDB--coming from a relational database background. I want to design a question structure with ... have to create a new collection for comments? Question&Answers:os...

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xml - XSLT Transform doesn't work until I remove root node

I'm trying to extract the headline from the below XML from the Met Office web service using XSLT, however my XSLT ... that's how they present it. Any ideas? Question&Answers:os...

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javascript - How to use FormData for AJAX file upload?

This is my HTML which I'm generating dynamically using drag and drop functionality. <form method="POST" id="contact" name ... (data){ alert(data); } }); } Question&Answers:os...

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haskell - What is the monomorphism restriction?

I'm puzzled by how the haskell compiler sometimes infers types that are less polymorphic than what I'd expect, ... in Haskell as discussed in the meta question. Question&Answers:os...

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Increase heap size in Java

I am working on a Windows 2003 server (64-bit) with 8 GB RAM. How can I increase the heap memory maximum? I ... memory to 75% of physical memory (6 GB Heap)? Question&Answers:os...

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c - typedef struct vs struct definitions

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ios - What is the best way to deal with the NSDateFormatter locale "feechur"?

It seems that NSDateFormatter has a "feature" that bites you unexpectedly: If you do a simple "fixed" format ... . Final answer See the accepted answer below. Question&Answers:os...

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html - Set cookie and get cookie with JavaScript

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c# - How does one parse XML files?

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python - Get key by value in dictionary

I made a function which will look up ages in a Dictionary and show the matching name: dictionary = {'george' : ... t figure out how to make it search backwards. Question&Answers:os...

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pretty-print JSON using JavaScript

How can I display JSON in an easy-to-read (for human readers) format? I'm looking primarily for indentation ... with perhaps even colors / font-styles / etc. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

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