python 从二维列表(2D)中获得第一列的3种方法答:方法一:使用列表推导式。list1 = [["a",1],["b",2]]column1 = [i[0] for i in list1]方法二:使用zip函数与解包。list1 = [["a",1],["b",2]]column1, _ = zip(*list1)方法三:多层列表推导式。list1 = [["a",1],["b",2]]columns = [[d[k] for d in list1...
python字符串矩阵 如何取其中的一列或几列?答:"abcde","fghij","klmno","pqrst","uvwxy"]取第一列 column1 = [row[0] for row in matrix]print(column1) # 输出: ['a', 'f', 'k', 'p', 'u']取第二和第三列 column2_3 = [row[1:3] for row in matrix]print(column2_3) # 输出: ['bc', 'gh', 'lm', 'qr'...