摘要： Examples from Learning Python 4th editionM = [[1,2,3],[2,3,4],[3,4,5]col2 = [row[1] for row in M][row[1] + 1 for row in M][row[1] for row in M if row[1] % 2 == 0]diag = [M[i][i] for i in [0,1,2]]G = (sum(row) for row in M) #Create a generator of row sumsnext(G) #Run the ite... 阅读全文