python - Creating N-dimensional dynamical array based on user's input? -


an ascii file has 61 columns, columns read using readlines(). user has option specify how many columns use create n-dimennsional array based on his/her choice of number of columns.

i want create dynamic n-dimensional array such as:

from numpy import * file = open('test.txt','rb')  choice = float(raw_input('how many columns want use: \t'))  = [[],[],[],...]  # n-dimensional array (rows = 486, columns = n)

such has dimensions based on user's choice 'choice'. 'n' can change between 1 , 61. how go doing this?

-thanks!

>>> rows = 486 >>> columns = 5 >>> = [[none] * columns x in xrange(rows)] >>> len(a) 486 >>> len(a[0]) 5

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