How can I find the dimensions of a matrix in Python?

Question

How can I find the dimensions of a matrix in Python. Len(A) returns only one variable.

Edit:

close = dataobj.get_data(timestamps, symbols, closefield) 

Is (I assume) generating a matrix of integers (less likely strings). I need to find the size of that matrix, so I can run some tests without having to iterate through all of the elements. As far as the data type goes, I assume it's an array of arrays (or list of lists).

Answer 1

The number of rows of a list of lists would be: len(A) and the number of columns len(A[0]) given that all rows have the same number of columns, i.e. all lists in each index are of the same size.

Answer 2

If you are using NumPy arrays, shape can be used. For example

  >>> a = numpy.array([[[1,2,3],[1,2,3]],[[12,3,4],[2,1,3]]])   >>> a   array([[[ 1,  2,  3],          [ 1,  2,  3]],           [[12,  3,  4],          [ 2,  1,  3]]])  >>> a.shape  (2, 2, 3)