我如何并排添加列表（而不是通过使用追加）？

Question

I need to add lists in side ways, not in the below. So I think 'append()' is not appropriate. 'concat()' seems to be adding in side ways, but not working for lists.

Do I need to use concat() to add list side ways? If so, how can I do that with lists?

months = range(1,3)

pieces=[]
columns = ['id','q1','q2','q3']

for month in months:
    path = 'C:/Users/uib57309/Desktop/newfolder/01_Survey/month/%d.csv' %month
    frame = pd.read_csv(path, names = columns)

    frame['month'] = month
    pieces.append(frame)

names = pd.concat(pieces)
print(names)

I used the append(), so the list was added in the below.

Answer 1

You can use .extend

eg:

a = [1,2,3,4]
b = [5,6,7,8]

a.append(b)
print(a)
[1,2,3,4,[5,6,7,8]]

a.extend(b)
print(a)
[1,2,3,4,5,6,7,8]