Is the a short syntax for joining a list of lists into a single list( or iterator) in python? 15 Answers ...

... I think the others have done a good job at explaining why cnt > 0, but there's not enough details regarding why cnt = 4, and why cnt varies so widely among different settings. I will attempt to fill that void here. Let X be the total stack size M be the stack sp...

...lem: A problem with a yes or no answer. Now, let us define those complexity classes. P P is a complexity class that represents the set of all decision problems that can be solved in polynomial time. That is, given an instance of the problem, the answer yes or no can be decided in polynomial t...

I love Ruby's ||= mechanism. If a variable doesn't exist or is nil , then create it and set it equal to something: 6 Ans...

...ored. So "C:\\Users\\Rich" is the same as @"C:\Users\Rich" There is one exception: an escape sequence is needed for the double quote. To escape a double quote, you need to put two double quotes in a row. For instance, @"""" evaluates to ". ...

... answered Jul 21 '11 at 9:02 XionXion 20.1k88 gold badges4646 silver badges7777 bronze badges ...

Specifically I've seen it used in the context of text filtering. As if "predicate" == "filter criteria". 7 Answers ...

... Thank you for this. To expand this a little bit. In counting amount of arbitrary value, other than NA is writing a boolean function is.value and then using sum(is.value(df$col)) the way to go or is there a more concise direct syntax for this? ...

...rough the ipython notebook. I'm trying to add some annotation lines to an existing graph and I can't figure out how to render the lines on a graph. So, for example, if I plot the following: ...

In Python, is there a portable and simple way to test if an executable program exists? 21 Answers ...