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Is there an integer square root somewhere in python, or in standard libraries? I want it to be exact (i.e. ... like this must surely exist in python already... Question&Answers:os...

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performance - DataFrame / Dataset groupBy behaviour/optimization

Suppose we have DataFrame df consisting of the following columns: Name, Surname, Size, Width, Length, ... ) before grouping somehow affect the performance? Question&Answers:os...

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c# - How to let an ASMX file output JSON

I created an ASMX file with a code behind file. It's working fine, but it is outputting XML. However, I need it to output ... new string[] { "abc", "def" }; } } Question&Answers:os...

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Regex using javascript to return just numbers

If I have a string like "something12" or "something102", how would I use a regex in javascript to return just the number parts? Question&Answers:os...

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Split string on spaces in Java, except if between quotes (i.e. treat "hello world" as one token)

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android - updating Google play services in Emulator

I have gone through many questions like this on Google Play, I am using Android 4.2.2 API 17. My ... Play services without downloading any latest API version ? Question&Answers:os...

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Is there a max number of arguments JavaScript functions can accept?

I know that JavaScript functions can accept "any" number of arguments. function f(){}; f(1,2,3,4 /*. ... specification, but I might not be connecting some dots. Question&Answers:os...

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jquery - Find a string of text in an element and wrap some span tags round it

I want to find a string of text in an element and wrap some span tags round it. E.g. From: <h2>We have ... }); But that only wraps the whole containing h2 tag. Question&Answers:os...

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How can I determine installed SQL Server instances and their versions?

I'm trying to determine what instances of sql server/sql express I have installed (either manually or ... 'm already connected to a particular instance. Question&Answers:os...

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sql server - How can I select the first day of a month in SQL?

I just need to select the first day of the month of a given DateTime variable. I know it's quite easy to do using ... way to do this? I'm using SQL Server 2008. Question&Answers:os...

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Format / Suppress Scientific Notation from Python Pandas Aggregation Results

How can one modify the format for the output from a groupby operation in pandas that produces scientific ... and add decimals. sum_sales_dept.astype(str) Question&Answers:os...

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ios - The best way to remove duplicate values from NSMutableArray in Objective-C?

The best way to remove duplicate values (NSString) from NSMutableArray in Objective-C? Is this the easiest ... = [[NSSet setWithArray:yourarray] allObjects]; Question&Answers:os...

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How do I write a Python dictionary to a csv file?

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Two versions of python on linux. how to make 2.7 the default

I've got two versions of python on my linuxbox: $python Python 2.6.6 (r266:84292, Jul 10 2013, 22:48:45) [GCC 4 ... so when I type python it puts me in 2.7? Question&Answers:os...

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How to detect the screen resolution with JavaScript?

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regex - What is a regular expression which will match a valid domain name without a subdomain?

I need to validate a domain name: google.com stackoverflow.com So a domain in its rawest form - not even a ... #1 Thanks very much, believe me I did try! Question&Answers:os...

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How to get JavaScript caller function line number? How to get JavaScript caller source URL?

I am using the following for getting the JavaScript caller function name: var callerFunc = arguments.callee.caller. ... was called from? Or the source URL? Question&Answers:os...

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asp.net mvc - Polymorphic model binding

This question has been asked before in earlier versions of MVC. There is also this blog entry about a way to work ... (), you'll have to add it yourself. Question&Answers:os...

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How to work with complex numbers in C?

How can I work with complex numbers in C? I see there is a complex.h header file, but it doesn't give ... ? Is there native functions to get module and phase? Question&Answers:os...

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string - How to replace Microsoft-encoded quotes in PHP

I need to replace Microsoft Word's version of single and double quotations marks ( ') with regular quotes (' ... array. Is there a better way to do this? Question&Answers:os...

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reactjs - How to use `setState` callback on react hooks

React hooks introduces useState for setting component state. But how can I use hooks to replace the callback like ... which can be used with useState hook. Question&Answers:os...

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html - Make flex items take content width, not width of parent container

I have a container <div> with display: flex. It has a child <a>. How can I make the child appear "inline"? Specifically ... "> <a href="#">Test</a> </div> Question&Answers:os...

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Why doesn't .NET/C# optimize for tail-call recursion?

I found this question about which languages optimize tail recursion. Why C# doesn't optimize tail recursion, whenever possible? ... .WriteLine(i); Foo(i+1); } Question&Answers:os...

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recursion - Tower of Hanoi: Recursive Algorithm

Although I have no problem whatsoever understanding recursion, I can't seem to wrap my head around the recursive ... Perhaps someone can help me out? Thanks. Question&Answers:os...

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iteration - Iterate through Nested JavaScript Objects

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How to get current foreground activity context in android?

Whenever my broadcast is executed I want to show alert to foreground activity. Question&Answers:os...

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swift3 - How to provide a localized description with an Error type in Swift?

I am defining a custom error type with Swift 3 syntax and I want to provide a user-friendly description of the ... it work without casting to my error type? Question&Answers:os...

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mysql - How to fix "Incorrect string value" errors?

After noticing an application tended to discard random emails due to incorrect string value errors, I went though and ... no idea if such a fix makes sense. Question&Answers:os...

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

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