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python - About the changing id of an immutable string

Something about the id of objects of type str (in python 2.7) puzzles me. The str type is immutable, so I ... id('hello') 139978087896384 Now it is equal... Question&Answers:os...

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

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console - Simple C scanf does not work?

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

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linux - Inner join on two text files

Looking to perform an inner join on two different text files. Basically I'm looking for the inner join ... Nbr 3|Alien Registration Card LUA|tmp_preapp-DOB Question&Answers:os...

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

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Declaring a custom android UI element using XML

How do I declare an Android UI element using XML? Question&Answers:os...

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

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sql - How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?

Can anyone explain how to implement one-to-one, one-to-many and many-to-many relationships while designing tables with some examples? Question&Answers:os...

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

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How can I unset a JavaScript variable?

I have a global variable in JavaScript (actually a window property, but I don't think it matters) which was already ... way to go about it. What do you think? Question&Answers:os...

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

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python - Maximum and Minimum values for ints

I am looking for minimum and maximum values for integers in python. For eg., in Java, we have Integer. ... MAX_VALUE. Is there something like this in python? Question&Answers:os...

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

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c - Overloading Macro on Number of Arguments

I have two macros FOO2 and FOO3: #define FOO2(x,y) ... #define FOO3(x,y,z) ... I want to define a new macro FOO as ... (x,y) to FOO2, and FOO(x,y,z) to FOO3? Question&Answers:os...

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

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Using arrays or std::vectors in C++, what's the performance gap?

In our C++ course they suggest not to use C++ arrays on new projects anymore. As far as I ... use arrays. But are there significant performance differences? Question&Answers:os...

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

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regex - How to find patterns across multiple lines using grep?

I want to find files that have "abc" AND "efg" in that order, and those two strings are on different lines ... blah blah blah.. blah blah.. Should be matched. Question&Answers:os...

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

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Remove duplicates from a List<T> in C#

Anyone have a quick method for de-duplicating a generic List in C#? Question&Answers:os...

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

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javascript - Is it not possible to stringify an Error using JSON.stringify?

Reproducing the problem I'm running into an issue when trying to pass error messages around using web sockets ... answer provides a workaround for this problem. Question&Answers:os...

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

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random - Is it correct to use JavaScript Array.sort() method for shuffling?

I was helping somebody out with his JavaScript code and my eyes were caught by a section that looked like that: ... the results below as one of the answers. Question&Answers:os...

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

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.net - What is the difference between String.Empty and "" (empty string)?

In .NET, what is the difference between String.Empty and "", and are they interchangable, or is there some ... that String.Empty will ensure are not a problem? Question&Answers:os...

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

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javascript - Why is typeof null "object"?

I'm reading 'Professional Javascript for Web Developers' Chapter 4 and it tells me that the five types of ... reference), hence making it NOT a primitive? Question&Answers:os...

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

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ios - Upload image with parameters in Swift

I'm trying to upload an image with parameters in Swift. When I try this code, I can get the ... : boundary) println(request.debugDescription) return request } Question&Answers:os...

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

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c - What is the difference between sigaction and signal?

I was about to add an extra signal handler to an app we have here and I noticed that the author had used ... I was writing from scratch, which should I choose? Question&Answers:os...

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

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java - Is there a way to refer to the current type with a type variable?

Suppose I'm trying to write a function to return an instance of the current type. Is there a way to make T refer ... class B extends A { @Override T foo(); } Question&Answers:os...

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

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How does MongoDB sort records when no sort order is specified?

When we run a Mongo find() query without any sort order specified, what does the database internally use to sort ... that my test cases weren't very thorough. Question&Answers:os...

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

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Objective C Equivalent of PHP's "Variable Variables"

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

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android - How to add dividers and spaces between items in RecyclerView

This is an example of how it could have been done previously in the ListView class, using the divider and ... there a better way to achieve my goal? Question&Answers:os...

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

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optional - What does an exclamation mark mean in the Swift language?

The Swift Programming Language guide has the following example: class Person { let name: String init(name: String) { ... answers below, made a lot more sense. Question&Answers:os...

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

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android - Determine if the device is a smartphone or tablet?

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

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How can I fill out a Python string with spaces?

I want to fill out a string with spaces. I know that the following works for zero's: >>> print "'%06d'"%4 ' ... +" "*leftover, but I'd like the shortest way. Question&Answers:os...

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

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php - Multiple returns from a function

Is it possible to have a function with two returns like this: function test($testvar) { // Do something return ... I be able to get each return separately? Question&Answers:os...

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

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wpf - Virtualizing an ItemsControl?

I have an ItemsControl containing a list of data that I would like to virtualize, however VirtualizingStackPanel. ... but that doesn't seem to help. Question&Answers:os...

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

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Can the Android drawable directory contain subdirectories?

In the Android SDK documentation, all of the examples used with the @drawable/my_image xml syntax directly ... the hierarchy flat in the drawable directory. Question&Answers:os...

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

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How to convert file to base64 in JavaScript?

UPD TypeScript version is also available in answers Now I'm getting File object by this line: file = document. ... I do to convert it to base64 string? Question&Answers:os...

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

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