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pandas: multiple conditions while indexing data frame - unexpected behavior

... As you can see, the AND operator drops every row in which at least one value equals -1. On the other hand, the OR operator requires both values to be equal to -1 to drop them. That's right. Remember that you're writing the condition in terms of what you want to keep, not in terms of w...
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What is the difference between Xamarin.Form's LayoutOptions, especially Fill and Expand?

...ions and VerticalOptions . Both are of type LayoutOptions and can have one of the following values: 3 Answers ...
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Creating an abstract class in Objective-C

...en inherit this class for example 10 times and forgot to implement this in one of classes u will get message with name of Base class not inherited one like Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[BaseDynamicUIViewController localizeUI] must be overridden in...
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How do I find the time difference between two datetime objects in python?

...the getting started code example could be written as d = datetime.now(timezone(EST)) (one readable line instead of five). – jfs Jan 10 '15 at 8:57 1 ...
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Resize a large bitmap file to scaled output file on Android

... No. I'd love for someone to correct me, but I accepted the load/resize approach you tried as a compromise. Here are the steps for anyone browsing: Calculate the maximum possible inSampleSize that still yields an image larger than your target. ...
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What is the difference between `-fpic` and `-fPIC` gcc parameters?

...still can't understand the difference between -fpic and -fPIC . Can someone explain it, in a very simple and clear way? ...
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How do I update a formula with Homebrew?

...ad of seconds. That is a very bad design. The correct way to "JUST upgrade one single package" is "brew install <packagename>", which is again a confusing design. – xuancong84 Jul 21 at 7:24 ...
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Which mime type should I use for mp3

...s There is no such thing as multiple mime types, because a file is only of one type. Ideally, you would return audio/mpeg if you are returning an mp3 file or audio/wav if you are returning a wav file. You could use the generic application/octet-stream to indicate a binary file if you didn't want to...
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How can I send large messages with Kafka (over 15MB)?

... One key thing to remember that message.max.bytes attribute must be in sync with the consumer's fetch.message.max.bytes property. the fetch size must be at least as large as the maximum message size otherwise there could be si...
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How to get a user's client IP address in ASP.NET?

... are asking. If you describe the problem you are trying to solve maybe someone can help? E.g. are you trying to uniquely identify your users? Could you use a cookie, or the session ID perhaps instead of the IP address? Edit The address you see on the server shouldn't be the ISP's address, as...