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python - Is there a recursive version of the dict.get() built-in?

I have a nested dictionary object and I want to be able to retrieve values of keys with an arbitrary depth. I' ... about 3.x solutions as well. 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 - How to group a pandas dataframe by a defined time interval?

I have a dataFrame like this, I would like to group every 60 minutes and start grouping at 06:30. data ... and thanks very much in advance See Question&Answers more detail:os...

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

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assembly - How to generate plain binaries like nasm -f bin with the GNU GAS assembler?

I have some NASM files that generally have the structure: [BITS 64] [ORG 0x0000000000200000] start: ... ret I'm ... f bin option does with NASM. See Question&Answers more detail:os...

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

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oracle11g - Auto Increment for Oracle

I need to create a sequence and a trigger to auto-increment the primary key on a table but I have no idea on how to do it. See Question&Answers more detail:os...

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

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excel - Retrieving the COM class factory for component failed

I am using an excel object (COM component) for excel manipulation. It works fine on my PC, but when I ... gives the same error. Please help 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 do I insert a JPEG image into a python Tkinter window?

How do I insert a JPEG image into a Python 2.7 Tkinter window? What is wrong with the following code? ... ) raw_input() window.mainloop() 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 - React functional components vs classical components

I'm trying to understand when to use React functional components vs. classes and reading from the docs ... use functional components instead. See Question&Answers more detail:os...

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

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git - .gitattributes & individual merge strategy for a file

I have a master and a test branch of my (web) application. These projects are almost the same, except for one ... merge and setup is "test'.) See Question&Answers more detail:os...

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

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r - Filter data frame rows based on values in vector

What is the best way to filter rows from data frame when the values to be deleted are stored in a vector? ... a filter based on multiple values? See Question&Answers more detail:os...

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

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ruby - Nokogiri/Xpath namespace query

I'm trying to pull out the dc:title element using an xpath. I can pull out the metadata using the following ... xpath with the above xml doc. 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 - window.scroll({ behavior: 'smooth' }) not working in Safari

As the title says, it works perfectly fine on Chrome. But in Safari, it just sets the page to the desired top ... a way to make it work nicely? 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++ - How does the modulus operator work?

Let's say that I need to format the output of an array to display a fixed number of elements per line. ... i find the exact expression needed? 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 - Count words in a string method?

I was wondering how I would write a method to count the number of words in a java string only by using string ... any help I can get! Thanks! See Question&Answers more detail:os...

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

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Why python has limit for count of file handles?

I writed simple code for test, how much files may be open in python script: for i in xrange(2000): fp = ... many open files: 'files/file_509' See Question&Answers more detail:os...

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

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Get a node's inner XML as String in Java DOM

I have an XML org.w3c.dom.Node that looks like this: <variable name="variableName"> <br /><strong>foo</strong ... /strong> bar part as a String? See Question&Answers more detail:os...

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

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Convert javascript dot notation object to nested object

I'm trying to build a function that would expand an object like : { 'ab.cd.e' : 'foo', 'ab.cd.f' ... ::expand() Without using eval of course. See Question&Answers more detail:os...

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

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node.js - How to cancel HTTP upload from data events?

Given this simple webserver code: console.log('starting'); var server = require('http').createServer(); server.on(' ... . How do I do it? See Question&Answers more detail:os...

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

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combinatorics - Number of combinations (N choose R) in C++

Here I try to write a program in C++ to find NCR. But I've got a problem in the result. It is not correct. ... n,r); cout<<result; return 0; } See Question&Answers more detail:os...

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

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php - int((0.1+0.7)*10) = 7 in several languages. How to prevent this?

Recently I came across a bug/feature in several languages. I have a very basic knowledge about how it's caused ( ... 7)*10) => 7.999999999999999 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 write string literals in python without having to escape them?

Is there a way to declare a string variable in python such that everything inside of it is automatically escaped, ... of a solution? Thanks! See Question&Answers more detail:os...

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

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jsp - How to configure welcome file list in web.xml

I have this in my web.xml document. I am trying to have a welcome list so I dont need to type the path for ... url...How to do this correctly? See Question&Answers more detail:os...

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

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Get specific element in a list or array using EL

Is it possible to get specific element in list or array using EL in a Java EE page (Facelets or JSP), or do I have to create a custom EL method? 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++ - Practical Use of Zero-Length Bitfields

I am not totally sure about C, but C++ allows unnamed bit-fields of 0 length. For example: struct X { ... practical uses so they still hold :) 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 catch JNI/Java Exception

I have a JNI layer in my application. In some cases Java throws an exception. How can I get the Java exception ... pass it to my logger module? 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++ - Why does "extern const int n;" not work as expected?

My project consists of only two source files: a.cpp: const int n = 8; b.cpp: extern const int n; int main( ... I just wonder WHY it does'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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java - How do I Dynamically create a Test Suite in JUnit 4?

I would like to create a junit test suite using JUnit 4 where the names of the test classes to be ... somewhere. Does anyone know where? See Question&Answers more detail:os...

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

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VBA collection: list of keys

After I add some values to the VBA collection, is there any way to retain the list of all keys? For ... 'm using VBA through AutoCAD 2007 See Question&Answers more detail:os...

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

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190 views

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html - CSS data attribute new line character & pseudo-element content value

Is it possible to have a new line in a data attribute ? I am trying to do something like this: CSS: [data- ... but still does not work for me. See Question&Answers more detail:os...

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

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