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If you want to convert a string list to an int list (each string in the list goes to int), for example

[python]  [' 0 ', ' 1 ', ' 2 ']--[0,1,2]    can be used: [Python]   [int (x) for x in list]    Or use the map operation: Map (func, list) apply Func to each element in the list. [Python]  map (int, list)    assumes a 2-dimensional array (implemented with list): [python]  list = [[0,1,2],[3,1,4]]    If you want to get the sum of each line, you can use the following two ways: [python]  >>> list = [[[0,1,2],[3,1,4]]  >>> [sum (x) for x in list]   [3, 8]  >>> map (sum,list)  [3, 8]    if you want to get the sum of each column, you need to unzip the list with a zip (*list) to get a list of tuples, Where the I tuple contains the I element for each line: [python]  >>> list = [[[0,1,2],[3,1,4]]  >>> zip (*list)  [(0, 3), (1 , 1), (2, 4)]  >>> [sum (x) for x in Zip (*list)]  [3, 2, 6]  >>> map (sum,zip (*list)) &nbsp ; [3, 2, 6]    The following example is about zip and unzip (actually zip and * together) how work:[python] >>> x=[1,2,3]  >>> y=[4,5,6]  >>> zipped = Zip (x, y)  >>> zipped  [(1, 4), (2, 5), (3, 6)]  >>> X2,y2=zip(*zipped)  >>> x2   (1, 2, 3)  >>> y2   (4, 5, 6)  >>> X3,y3=map (List,zi P (*zipped))  >>> X3  [1, 2, 3]  >>> y3  [4, 5, 6]  

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