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String comparison in Python: is vs. == [duplicate]
I noticed a Python script I was writing was acting squirrelly, and traced it to an infinite loop, where the loop condition was while line is not '' . Running through it in the debugger, it turned out that line was in fact '' . When I changed it to !='' rather than is not '' , it worked fine.
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Convert a RGB Color Value to a Hexadecimal String
In my Java application, I was able to get the Color of a JButton in terms of red, green and blue; I have stored these values in three int s.
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Tuples( or arrays ) as Dictionary keys in C#
I am trying to make a Dictionary lookup table in C#. I need to resolve a 3-tuple of values to one string. I tried using arrays as keys, but that did not work, and I don't know what else to do. At this point I am considering making a Dictionary of Dictionaries of Dictionaries, but that would proba...
In Python how should I test if a variable is None, True or False
I have a function that can return one of three things:
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How do I find the duplicates in a list and create another list with them?
How can I find the duplicates in a Python list and create another list of the duplicates? The list only contains integers.
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Constructors in JavaScript objects
Can JavaScript classes/objects have constructors? How are they created?
19 Answers
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How to directly initialize a HashMap (in a literal way)?
Is there some way of initializing a Java HashMap like this?:
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Is there a better way to iterate over two lists, getting one element from each list for each iterati
I have a list of Latitudes and one of Longitudes and need to iterate over the latitude and longitude pairs.
7 Answers
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Convert the values in a column into row names in an existing data frame
I would like to convert the values in a column of an existing data frame into row names. Is is possible to do this without exporting the data frame and then reimporting it with a row.names = call?
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URL encoding in Android
How do you encode a URL in Android?
7 Answers
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