how do i make list of list python

Question

Extracting data from Excel sheet

for value in quoted.findall(str(row[2])):
    i.append(value.replace('"', '').strip())
print i

Then i get a set of lists as below

['M', 'N', 'O']
['P', 'Q', 'R']
['S', 'T', 'U']
['W', 'X', 'Y']

how do i make this set of list in another list, i am expecting output as

[ ['M', 'N', 'O'], ['P', 'Q', 'R'], ['S', 'T', 'U'], ['W', 'X', 'Y'] ]

if i want to access this list, i simply use listOfList[2] and i should get

['S', 'T', 'U']

thanks in advance.

Answer 1

与Nirk的答案相同，但使用列表推导：

j = [[value.replace('"', '').strip() for value in quoted.findall(str(row[2]))] for row in ...]

Answer 2

Instead of printing. just append the entire list to another list:

j=[];
for row in ... :
    i = []
    for value in quoted.findall(str(row[2])):
        i.append(value.replace('"', '').strip())

    j.append(i)