大约有 9,000 项符合查询结果(耗时:0.0155秒) [XML]

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Impossible to Install PG gem on my mac with Mavericks

I'm trying to install the pg gem in order to work again with my rails projects. But I get this error: 26 Answers ...
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Convert date to datetime in Python

Is there a built-in method for converting a date to a datetime in Python, for example getting the datetime for the midnight of the given date? The opposite conversion is easy: datetime has a .date() method. ...
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What is the purpose of class methods?

I'm teaching myself Python and my most recent lesson was that Python is not Java , and so I've just spent a while turning all my Class methods into functions. ...
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Python regular expressions return true/false

Using Python regular expressions how can you get a True / False returned? All Python returns is: 6 Answers ...
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How do you use the ? : (conditional) operator in JavaScript?

Can someone please explain to me in simple words what is the ?: (conditional, "ternary") operator and how to use it? 18 ...
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Angular - ui-router get previous state

Is there a way to get the previous state of the current state? 14 Answers 14 ...
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Calculating text width

I'm trying to calculate text width using jQuery. I'm not sure what, but I am definitely doing something wrong. 22 Answers ...
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Run class in Jar file

If you have a jar file called myJar.jar located in /myfolder and you want to use the class called myClass from it, how do you go about doing it from the command line? ...
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What character to use to put an item at the end of an alphabetic list?

... ' _ ' to the item I want in first position. Is there some sort of magical character I could use to put an item at the end of the list? ...
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Is there a way to access the “previous row” value in a SELECT statement?

I need to calculate the difference of a column between two lines of a table. Is there any way I can do this directly in SQL? I'm using Microsoft SQL Server 2008. ...