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Pandas DataFrame Groupby two columns and get counts

I have a pandas dataframe in the following format: 6 Answers 6 ...
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How can I scale an image in a CSS sprite

...an you please tell me if it is possible/how I can crop off a smaller image and then scale the cropped off region before I lay it out? ...
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When is layoutSubviews called?

...ith the answer (or any I could find on the net), so I tried it in practice and here is what I got: init does not cause layoutSubviews to be called (duh) addSubview: causes layoutSubviews to be called on the view being added, the view it’s being added to (target view), and all the subviews of th...
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HTML Form: Select-Option vs Datalist-Option

I was wondering what the differences are between Select-Option and Datalist-Option. Is there any situation in which it would be better to use one or the other? An example of each follows: ...
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What is a Context Free Grammar?

...to me what a context free grammar is? After looking at the Wikipedia entry and then the Wikipedia entry on formal grammar, I am left utterly and totally befuddled. Would someone be so kind as to explain what these things are? ...
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Access properties file programmatically with Spring?

... here is a question, how is this different from mine, and has two more votes AND posted second... – Zoidberg Nov 20 '09 at 16:07 3 ...
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Why should I use tags vs. release/beta branches for versioning?

I've been using git for about a year and would like to use tagging to, well, tag commits at different versions. I've found lots of info on the commands to use to work with tags, but what I'd like to know is why use tagging at all if I can just create a new branch called 1.1.0 and not have to cloud...
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How to commit no change and new message?

How can I make a new commit and create a new message if no changes are made to files? 5 Answers ...
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Determine a user's timezone

Is there a standard way for a web server to be able to determine a user's timezone within a web page? 24 Answers ...
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How to read and write excel file

I want to read and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it? ...