import csv
import pandas as pd
a = [['a', [1,2]],['b',[3,4]]]
df = pd.DataFrame(a)
df.to_csv('i.csv', sep = '\t', header = None, encoding='1251', index = False)
dff = pd.read_csv("i.csv",sep = '\t', header = None, encoding='1251')
print(dff)
print('#############')
b = a[1][1]
print(b[0])
print(type(b))
ind = dff[1][1]
print(ind)
print(type(ind))
ii = ind
print(ii[0])
print(type(ii))

  0       1
0  a  [1, 2]
1  b  [3, 4]
#############
3
<class 'list'>
[3, 4]
<class 'str'>
[
<class 'str'>