Python: Assign one element from a list to elements in other list

Question

i got two lists:

L_1 = ['Value1', 'Value2', 'Value3', 'Value 4']
L_2 = [['Value1', 'Value1_01'], ['', 'Value1_02'], ['', 'Value1_03'], 
 ['Value2', 'Value2_01'], ['', 'Value2_02'], 
 ['Value3', 'Value3_01'], ['', 'Value3_02'], ['', 'Value3_03'], ['', 'Value3_04']
 ['Value4', 'Value4_01'], ['', 'Value4_02']]

from this i need a list that assign the elements Value1 to Value4 to their 'littler sisters'. should look like this:

L1 = ['Value1', 'Value2', 'Value3', 'Value 4']
L_res = [['Value1_01', 'Value1_02', 'Value1_03'], 
 ['Value2_01', 'Value2_02'], 
 ['Value3_01', 'Value3_02', 'Value3_03', 'Value3_04']
 ['Value4_01', 'Value4_02']

i need to count where L2[i][0] == '' or L2[i][0] == L1[i] and then give me the values from L2[i][1] and put it to L_res

Hopefully someone of you understand the problem and has got an idea to solve the problem.

I really appreciate this

Answer 1

This should do the trick:

L_res = []
for i in L_2:
 if i[0]:
 L_res.append([i[1]])
 else:
 L_res[-1].append(i[1])
L_res
# [['Value1_01', 'Value1_02', 'Value1_03'],
# ['Value2_01', 'Value2_02'],
# ['Value3_01', 'Value3_02', 'Value3_03', 'Value3_04'],
# ['Value4_01', 'Value4_02']]