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Compare two DataFrames and output their differences side-by-side

...rue Comment True dtype: bool Here the first entry is the index and the second the columns which has been changed. In [27]: difference_locations = np.where(df1 != df2) In [28]: changed_from = df1.values[difference_locations] In [29]: changed_to = df2.values[difference_locations] In [3...
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Heap vs Binary Search Tree (BST)

What is the difference between a heap and BST? 8 Answers 8 ...
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What is the >>>= operator in C?

...ague as a puzzle, I cannot figure out how this C program actually compiles and runs. What is this >>>= operator and the strange 1P1 literal? I have tested in Clang and GCC. There are no warnings and the output is "???" ...
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Selecting last element in JavaScript array [duplicate]

I'm making an application that updates a user's location and path in real time and displays this on a Google Map. I have functionality that allows multiple users to be tracked at the same time using an object, which is updated every second. ...
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How do I list all cron jobs for all users?

Is there a command or an existing script that will let me view all of a *NIX system's scheduled cron jobs at once? I'd like it to include all of the user crontabs, as well as /etc/crontab , and whatever's in /etc/cron.d . It would also be nice to see the specific commands run by run-parts in /e...
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SQL Server dynamic PIVOT query?

... So \@cols must be string-concatenated, right? We can't use sp_executesql and parameter-binding to interpolate \@cols in there? Even though we construct \@cols ourself, what if somehow it contained malicious SQL. Any additional mitigating steps I could take before concatenating it and executing it?...
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Solution to INSTALL_FAILED_INSUFFICIENT_STORAGE error on Android [closed]

The INSTALL_FAILED_INSUFFICIENT_STORAGE error is the bane of every Android developer's life. It happens regardless of app size, or how much storage is available. Rebooting the target device fixes the problem briefly, but it soon comes back. There are hundreds (if not thousands) of message board po...
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What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for Code

...alk for CodeMash 2012 basically points out a few bizarre quirks with Ruby and JavaScript. 5 Answers ...
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Difference between Python's Generators and Iterators

What is the difference between iterators and generators? Some examples for when you would use each case would be helpful. 1...
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sys.argv[1] meaning in script

I'm currently teaching myself Python and was just wondering (In reference to my example below) in simplified terms what the sys.argv[1] represents. Is it simply asking for an input? ...