Python- nested list derivations

The first list of expressions derived formulas can be any expression, further comprising a list of comprehension.
Consider the example below 3 × 4 matrix, which is implemented as a list of length 3 List 4:

list = [
    [1, 2, 3, 4],
    [5, 6, 7, 8],
    [9, 10, 11, 12]
]
#下面的列表推导式将转置行和列：
new_list = [[n[i] for n in list] for i in range(4)]
print(new_list)
#输出结果：
[[1, 5, 9], [2, 6, 10], [3, 7, 11], [4, 8, 12]]

---

The above example is equivalent to:

list = [
    [1, 2, 3, 4],
    [5, 6, 7, 8],
    [9, 10, 11, 12]
]
li = []
for i in range(4):
    li.append([n[i] for n in list])
print(li)
#输出结果：
[[1, 5, 9], [2, 6, 10], [3, 7, 11], [4, 8, 12]]

Built complex processes sentence function, zip () function is easier to achieve this:

list = [
    [1, 2, 3, 4],
    [5, 6, 7, 8],
    [9, 10, 11, 12]
]
list(zip(*list))
输出：
[(1, 5, 9), (2, 6, 10), (3, 7, 11), (4, 8, 12)]