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How to apply a function to two columns of Pandas dataframe

Suppose I have a df which has columns of 'ID', 'col_1', 'col_2' . And I define a function : 12 Answers ...
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Performance of Arrays vs. Lists

Say you need to have a list/array of integers which you need iterate frequently, and I mean extremely often. The reasons may vary, but say it's in the heart of the inner most loop of a high volume processing. ...
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Sort a list by multiple attributes?

I have a list of lists: 6 Answers 6 ...
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.NET String.Format() to add commas in thousands place for a number

I want to add a comma in the thousands place for a number. 21 Answers 21 ...
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Calling a Method From a String With the Method's Name in Ruby

How can I do what they are talking about here , but in Ruby? 4 Answers 4 ...
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How does the static modifier affect this code?

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C# Thread safe fast(est) counter

What is the way to obtain a thread safe counter in C# with best possible performance? 5 Answers ...
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Get a random boolean in python?

I am looking for the best way (fast and elegant) to get a random boolean in python (flip a coin). 8 Answers ...
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How does the socket API accept() function work?

The socket API is the de-facto standard for TCP/IP and UDP/IP communications (that is, networking code as we know it). However, one of its core functions, accept() is a bit magical. ...
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jQuery: How can i create a simple overlay?

How can I create a really basic overlay in jQuery without UI? 7 Answers 7 ...