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How to add to an existing hash in Ruby
...rds to adding an key => value pair to an existing populated hash in Ruby, I'm in the process of working through Apress' Beginning Ruby and have just finished the hashes chapter.
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What does 'super' do in Python?
What's the difference between:
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How to copy Java Collections list
... ArrayList and I want to copy it exactly. I use utility classes when possible on the assumption that someone spent some time making it correct. So naturally, I end up with the Collections class which contains a copy method.
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pandas GroupBy columns with NaN (missing) values
... have a DataFrame with many missing values in columns which I wish to groupby:
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How to return multiple objects from a Java method?
I want to return two objects from a Java method and was wondering what could be a good way of doing so?
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Python: TypeError: cannot concatenate 'str' and 'int' objects [duplicate]
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There are two ways to fix the problem which is caused by the last print statement.
You can assign the result of the str(c) call to c as correctly shown by @jamylak and then concatenate all of the strings, or you can replace the last print simply with this:...
Difference between \w and \b regular expression meta characters
Can anyone explain the difference between \b and \w regular expression metacharacters? It is my understanding that both these metacharacters are used for word boundaries. Apart from this, which meta character is efficient for multilingual content?
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Ship an application with a database
If your application requires a database and it comes with built in data, what is the best way to ship that application? Should I:
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Paste multiple columns together
I have a bunch of columns in a dataframe which I want to paste together (seperated by "-") as follows:
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Behaviour of final static method
I have been playing around with modifiers with static method and came across a weird behaviour.
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