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How do I create test and train samples from one dataframe with pandas?

I have a fairly large dataset in the form of a dataframe and I was wondering how I would be able to split the dataframe into two random samples (80% and 20%) for training and testing. ...
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Why #define TRUE (1==1) in a C boolean macro instead of simply as 1?

... This approach will use the actual boolean type (and resolve to true and false) if the compiler supports it. (specifically, C++) However, it would be better to check whether C++ is in use (via the __cplusplus macro) and actually use true and false. In a C compiler, this i...
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Finding local IP addresses using Python's stdlib

... addresses (i.e. 192.168.x.x or 10.0.x.x) in Python platform independently and using only the standard library? 45 Answers ...
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Mapping two integers to one, in a unique and deterministic way

Imagine two positive integers A and B. I want to combine these two into a single integer C. 18 Answers ...
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How can I access my localhost from my Android device?

I'm able to access my laptop web server using the Android emulator, I'm using 10.0.2.2:portno works well. 39 Answers ...
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Circle line-segment collision detection algorithm?

I have a line from A to B and a circle positioned at C with the radius R. 27 Answers ...
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Numpy first occurrence of value greater than existing value

I have a 1D array in numpy and I want to find the position of the index where a value exceeds the value in numpy array. 7 A...
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Could not load file or assembly 'System.Net.Http.Formatting' or one of its dependencies. The system

...ally take these steps: Go to the packages folder in the Windows Explorer and delete it. Open Visual Studio and Go to Tools > Library Package Manager > Package Manager Settings and under the Package Manager item on the left hand side there is a "Clear Package Cache" button. Click this button ...
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How to clear the canvas for redrawing

After experimenting with composite operations and drawing images on the canvas I'm now trying to remove images and compositing. How do I do this? ...
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Could not load file or assembly 'Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=3

...; section from my .config file. Reinstall brings it back if it's not there and apparently you need to delete it. Until there will be a normal solution in the package itself, I'm afraid this manual step is a must. Note: Please read the comments below before doing this. As per René's comment below...