It is because everything between the parentheses is loaded as one line. So %FileName% is expanded (at load time) before it is set (at run time). If you need to use the second format, you need to enable delayed expansion. Then you will have difficulty if the filename contains a !. This would work if … Read more
By definition foreach loop requires an Iterable to be passed in. It can be achieved with anonymous class: for (String s : new Iterable<String>() { @Override public Iterator<String> iterator() { return stream.iterator(); } }) { writer.append(s); } This can be simplified with lambda because Iterable is a functional interface: for (String s : (Iterable<String>) () … Read more
Apparently the looping construct in SQLite is the WITH RECURSIVE clause. That documentation link has sample count-to-ten code, a Mandelbrot set plotter, and a Sudoku puzzle solver, all in pure SQL. Here’s an SQLite query that computes the Fibonacci sequence to give you a feel for it: sqlite> WITH RECURSIVE …> fibo (curr, next) …> … Read more
Python’s for loops are different. i gets reassigned to the next value every time through the loop. The following will do what you want, because it is taking the literal version of what C++ is doing: i = 0 while i < some_value: if cond…: i+=1 …code… i+=1 Here’s why: in C++, the following code … Read more
That’s how I’d do it: import os directory = os.path.join(“c:\\”,”path”) for root,dirs,files in os.walk(directory): for file in files: if file.endswith(“.csv”): f=open(file, ‘r’) # perform calculation f.close()
I found the working example: {% set k = 10 %} {% for i in range(1, k) %} {{ i }} {% endfor %} Source: http://twig.sensiolabs.org/doc/templates.html (not very intuitive to find indeed).
s.union(r) is a new set with elements from both s and r.reference You need to change s.union(r) to s = s.union(r) or, use set.update.