Question

build the counter:

class Counters:
    def __init__(self,cats)
        self.form = collections.defaultdict(collections.Counter)

I get the length of the first dimension:

len(counters.form.items())

How to get the length of the second dimension?

Answer 1

If you’d want 2-d array in python, you should implement it that way:

x = 2
y = 3
nestedArray = [[0]*y for a in xrange(x)]

Then the array length would be x*y.

Or even better, use classes:

class NestedArray(object):
    def __init__(self, x, y, defaultValue=0):
        self.x = x
        self.y = y
        self.array = [[defaultValue]*y for a in xrange(x)]

    def __len__(self):
        return self.x * self.y

    def __getitem__(self, key):
            return self.array[key]

    def __setitem__(self, key, value):
            self.array[key] = value