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what is the most efficient way of counting occurrences in pandas?

I have a large (about 12M rows) dataframe df with say: 3 Answers 3 ...
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Difference between .keystore file and .jks file

I have tried to find the difference between .keystore files and .jks files, yet I could not find it. I know jks is for "Java keystore" and both are a way to store key/value pairs. ...
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Fixed point vs Floating point number

I just can't understand fixed point and floating point numbers due to hard to read definitions about them all over Google. But none that I have read provide a simple enough explanation of what they really are. Can I get a plain definition with example? ...
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Animate scroll to ID on page load

Im tring to animate the scroll to a particular ID on page load. I have done lots of research and came across this: 6 Answer...
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Toggle button using two image on different state

I need to make a toggle button using two image instead of ON/OFF state. 3 Answers 3 ...
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Change x axes scale in matplotlib

I created this plot using Matlab 4 Answers 4 ...
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JSP : JSTL's tag

Writing a JSP page, what exactly does the <c:out> do? I've noticed that the following both has the same result: 5 A...
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Difference between hard wrap and soft wrap?

I am in the process of writing a text editor. After looking at other text editors I have noticed that a number of them refer to a "soft" versus "hard" wrap. What is the difference? I can't seem to find the answer by searching. ...
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How to access the content of an iframe with jQuery?

How can I access the content of an iframe with jQuery? I tried doing this, but it wouldn't work: 3 Answers ...
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Why is an MD5 hash created by Python different from one created using echo and md5sum in the shell?

A Python MD5 hash is different than the one created by the md5sum command on the shell. Why? 1 Answer ...