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How do I get the row count of a pandas DataFrame?

I'm trying to get the number of rows of dataframe df with Pandas, and here is my code. 14 Answers ...
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How do I empty an array in JavaScript?

Is there a way to empty an array and if so possibly with .remove() ? 18 Answers 18 ...
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Get contentEditable caret index position

I'm finding tons of good, crossbrowser anwers on how to SET the cursor or caret index position in a contentEditable element, but none on how to GET or find its index... ...
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how do I make a single legend for many subplots with matplotlib?

I am plotting the same type of information, but for different countries, with multiple subplots with matplotlib. That is, I have 9 plots on a 3x3 grid, all with the same for lines (of course, different values per line). ...
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What's the syntax for mod in java

As an example in pseudocode: 17 Answers 17 ...
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How can I check which version of Angular I'm using?

How can I tell which version of Angular I am using? 28 Answers 28 ...
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postgresql return 0 if returned value is null

I have a query that returns avg(price) 3 Answers 3 ...
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Why does Math.Round(2.5) return 2 instead of 3?

In C#, the result of Math.Round(2.5) is 2. 15 Answers 15 ...
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#define macro for debug printing in C?

Trying to create a macro which can be used for print debug messages when DEBUG is defined, like the following pseudo code: ...
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How to crop circular area from bitmap in Android

I have a bitmap and I want to crop a circular region from this bitmap. All pixels outside the circle should be transparent. How can I do this? ...