Shi Mu wrote: >I can not understand the use of "cell" and "row" in the code: > > # convert the matrix to a 1D list > matrix = [[13,2,3,4,5],[0,10,6,0,0],[7,0,0,0,9]] > items = [cell for row in matrix for cell in row] > print items
working through the Python tutorial might be a good idea. here's the section on list comprehensions: http://docs.python.org/tut/node7.html#SECTION007140000000000000000 and here's the section on for loops: http://docs.python.org/tut/node6.html#SECTION006200000000000000000 briefly: items = [cell for row in matrix for cell in row] or, slightly edited for clarity: items = [(cell) for row in matrix for cell in row] is the same thing as: items = [] for row in matrix: for cell in row: items.append(cell) except that it's a bit shorter, and a bit more efficient. </F> -- http://mail.python.org/mailman/listinfo/python-list
