大约有 40,000 项符合查询结果(耗时:0.0674秒) [XML]

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Why is “if not someobj:” better than “if someobj == None:” in Python?

I've seen several examples of code like this: 9 Answers 9 ...
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HTTP Error 500.19 and error code : 0x80070021

...ld by Visual Studio 2013. It works well when I run it from VS13 but when I copy the project in local IIS it gives me the following error. ...
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IntelliJ IDEA: Move line?

I really like IntelliJ IDEA's "Move statement" shortcut ( Ctrl + Shift + ↑ / ↓ ). However -- I am not sure if this is a bug releated to ActionScript editing only -- move statement is not always what I want and sometimes it is not correct when editing AS code. ...
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How to get the list of all installed color schemes in Vim?

Is there a way to get a list of all installed color schemes in Vim? That would make very easy to select one without looking at the .vim directory. ...
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What's the best way to send a signal to all members of a process group?

I want to kill a whole process tree. What is the best way to do this using any common scripting languages? I am looking for a simple solution. ...
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Converting String to “Character” array in Java

I want to convert a String to an array of objects of Character class but I am unable to perform the conversion. I know that I can convert a String to an array of primitive datatype type "char" with the toCharArray() method but it doesn't help in converting a String to an array of objects of C...
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How can I recover a removed file in Mercurial (if at all)?

Accidentally, by using a GUI as opposed to CLI, I removed every file in a Mercurial project. 9 Answers ...
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Sending message through WhatsApp

Since I found some older posts, that tell that whatsapp doesn't support this, I was wondering if something had changed and if there is a way to open a whatsapp 'chat' with a number that I'm sending through an intent? ...
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Equivalent of “throw” in R

How does one "throw" an error in R? I have a function that takes a data frame and some column names and does stuff with them. If the columns don't exist, I want the function to stop and to stop all functions depending on it. ...
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data.table vs dplyr: can one do something well the other can't or does poorly?

I'm relatively familiar with data.table , not so much with dplyr . I've read through some dplyr vignettes and examples that have popped up on SO, and so far my conclusions are that: ...