大约有 42,000 项符合查询结果(耗时:0.0951秒) [XML]

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How do I access the request object or any other variable in a form's clean() method?

I am trying to request.user for a form's clean method, but how can I access the request object? Can I modify the clean method to allow variables input? ...
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How do I drop a MongoDB database from the command line?

What's the easiest way to do this from my bash prompt? 19 Answers 19 ...
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What is SELF JOIN and when would you use it? [duplicate]

What is self join and when would you use it? I don't understand self joins so a layman explanation with an example would be great. ...
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When does static class initialization happen?

When are static fields initialized? If I never instantiate a class, but I access a static field, are ALL the static blocks and private static methods used to instantiate private static fields called (in order) at that instant? ...
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namedtuple and default values for optional keyword arguments

I'm trying to convert a longish hollow "data" class into a named tuple. My class currently looks like this: 21 Answers ...
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Difference between @import and link in CSS

I'm learning some CSS to tweak my project template. I come to this problem and didn't find a clear answer on the web. Is there a difference between using @import or link in CSS? ...
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SQL Server SELECT LAST N Rows

This is a known question but the best solution I've found is something like: 18 Answers ...
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How can I change the color of a Google Maps marker?

I'm using the Google Maps API to build a map full of markers, but I want one marker to stand out from the others. The simplest thing to do, I think, would be to change the color of the marker to blue, instead of red. Is this a simple thing to do or do I have to create a whole new icon somehow? If I ...
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How to save an activity state using save instance state?

I've been working on the Android SDK platform, and it is a little unclear how to save an application's state. So given this minor re-tooling of the 'Hello, Android' example: ...
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Meaning of Choreographer messages in Logcat [duplicate]

I installed the latest versions of SDK (API 16) and got the latest ADT. I'm now seeing these messages in the logcat, that I'm quite sure, I haven't seen before. Does anyone have an idea about this? ...