如何将列表列表作为列添加到现有数据框

Question

I have created a dataframe "df" which looks like this:

   Name
0. School
1. Organisation 
2. Teacher 
3. Guest

now I have three lists

1. from=['12','18',['11','10'],['12','4','8']]
2. to = [['11','9'],'','8','3']
3. status = ['yes','no',['yes','no'],'']

I want to add these 3 lists to my existing dataframe df and it should look like this

  Name          From   To   Status
0. School        12    11   Yes
0. School               9
1. Organisation  18         No
2. Teacher       11     8   Yes
2. Teacher       10         No
3. Guest         12     3
3. Guest          4
3. Guest          8

I have tried df['from']=from and df['to']=to But this didn't give me table as I expected.

Answer 1

first,we should flatten the list with a index,then use the concat method of pandas like this:

import pandas as pd
df = pd.DataFrame({"Name":["School","Organisation","Teacher","Guest"]})
From = ['12','18',['11','10'],['12','4','8']]
def flat(nums):
    res = []
    index = []
    for i in range(len(nums)):
        if isinstance(nums[i], list):
            res.extend(nums[i])
            index.extend([i]*len(nums[i]))
        else:
            res.append(nums[i])
            index.append(i)
    return res,index
x="From"
list_flat,list_index=flat(eval(x))
dataframe = pd.DataFrame({x:list_flat},index=list_index)
df = pd.concat([df['Name'],dataframe],axis=1,sort=False)

the result is:

           Name From
0        School   12
1  Organisation   18
2       Teacher   11
2       Teacher   10
3         Guest   12
3         Guest    4
3         Guest    8