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How do you match only valid roman numerals with a regular expression?

Thinking about my other problem , i decided I can't even create a regular expression that will match roman numerals (let alone a context-free grammar that will generate them) ...
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How do I retrieve the number of columns in a Pandas data frame?

How do you programmatically retrieve the number of columns in a pandas dataframe? I was hoping for something like: 6 Answer...
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Is a Python list guaranteed to have its elements stay in the order they are inserted in?

If I have the following Python code 6 Answers 6 ...
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Given an RGB value, how do I create a tint (or shade)?

Given an RGB value, like 168, 0, 255 , how do I create tints (make it lighter) and shades (make it darker) of the color? 3...
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Less aggressive compilation with CSS3 calc

The Less compilers that I'm using ( OrangeBits and dotless 1.3.0.5 ) are aggressively translating 4 Answers ...
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Join strings with a delimiter only if strings are not null or empty

...orry if I'm missing something here, but I'm trying to find a simple way to concatenate only non-null or non-empty strings. ...
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Int to Char in C#

What is the best way to convert an Int value to the corresponding Char in Utf16, given that the Int is in the range of valid values? ...
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How to add a second css class with a conditional value in razor MVC 4

While Microsoft has created some automagic rendering of html attributes in razor MVC4, it took me quite some time to find out how to render a second css class on an element, based on a conditional razor expression. I would like to share it with you. ...
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What is “point free” style (in Functional Programming)?

A phrase that I've noticed recently is the concept of "point free" style... 5 Answers ...
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Regex not operator

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