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How to take column-slices of dataframe in pandas

I load some machine learning data from a CSV file. The first 2 columns are observations and the remaining columns are features. ...
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Get underlined text with Markdown

I am using BlueCloth as a Markdown library for Ruby, and I can't find any syntax for getting a text underlined. What is it? ...
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Remove last item from array

I have the following array. 25 Answers 25 ...
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Best way to represent a fraction in Java?

I'm trying to work with fractions in Java. 26 Answers 26 ...
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jQuery how to find an element based on a data-attribute value?

I've got the following scenario: 9 Answers 9 ...
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What is an abstract class in PHP?

What is an abstract class in PHP? 7 Answers 7 ...
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How to split a string into an array of characters in Python?

I've tried to look around the web for answers to splitting a string into an array of characters but I can't seem to find a simple method ...
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C/C++ macro string concatenation

Is it possible to concatenate have STR3 == "s1"? You can do this by passing args to another Macro function. But is there a direct way? ...
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Assign pandas dataframe column dtypes

I want to set the dtype s of multiple columns in pd.Dataframe (I have a file that I've had to manually parse into a list of lists, as the file was not amenable for pd.read_csv ) ...
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Where does Scala look for implicits?

An implicit question to newcomers to Scala seems to be: where does the compiler look for implicits? I mean implicit because the question never seems to get fully formed, as if there weren't words for it. :-) For example, where do the values for integral below come from? ...