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how do you filter pandas dataframes by multiple columns
... filter a dataframe (df) by a single column, if we consider data with male and females we might:
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How can I create a unique constraint on my column (SQL Server 2008 R2)?
I have SQL Server 2008 R2 and I want to set a unique column.
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What is the difference between ? and Object in Java generics?
...Eclipse seems to be giving me an option to choose between a type of Object and a type of '?'.
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Custom method names in ASP.NET Web API
...he WCF Web API to the new ASP.NET MVC 4 Web API. I have a UsersController, and I want to have a method named Authenticate. I see examples of how to do GetAll, GetOne, Post, and Delete, however what if I want to add extra methods into these services? For instance, my UsersService should have a method...
Correct way to try/except using Python requests module?
...the design of your script/program. Is it acceptable to exit? Can you go on and try again? If the error is catastrophic and you can't go on, then yes, you may abort your program by raising SystemExit (a nice way to both print an error and call sys.exit).
You can either catch the base-class exception...
What are C++ functors and their uses?
...about functors in C++. Can someone give me an overview as to what they are and in what cases they would be useful?
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How is OAuth 2 different from OAuth 1?
In very simple terms, can someone explain the difference between OAuth 2 and OAuth 1?
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what is the right way to treat Python argparse.Namespace() as a dictionary?
...t is okay to access the __dict__ attribute. It is a well-defined, tested, and guaranteed behavior.
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What does “xmlns” in XML mean?
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It defines an XML Namespace.
In your example, the Namespace Prefix is "android" and the Namespace URI is "http://schemas.android.com/apk/res/android"
In the document, you see elements like: <android:foo />
Think of the namespace prefix as a variable with a short name alias for the full n...
Format a date using the new date time API
...e. Use a LocalDateTime instead, assuming you want to represent both a date and time.
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