python2.7 create array in loop
Question: I would like to create a new variable in a loop with an index in which I write
a 2d matrix of data. Something like this:

    
    
    import numpy
    DARK = []
    a = []
    for i in range(0,3):
        # create 3d numpy array
        d = numpy.array([[1, 2], [3, 4]])
        a.append(d)
        stack = numpy.array(a)
        # write it into the actual variable (here is the problem)
        DARK[i] = numpy.median(stack)
    

I tried an approach with DARK.append but that gave me an list index out of
range error.


Answer: After 4 days of trying I found the answer myself. Thanks for the great help
guys...

    
    
    import numpy
    DARK = []
    a = []
    stack = []
    for i in range(0,3):
        # create 3d numpy array
        d = numpy.array([[1, 2], [3, 4]])
        a.append(d)
        stack.append(numpy.array(a))
        # write it into the actual variable
        DARK.append(numpy.array(numpy.median(stack[i], 0)))
    

