Mapping between matrices - python-3.x

Question

I have 2 matrices:
list_alpha = [['a'],
['b'],
['c'],
['d'],
['e']]
list_beta = [['1', 'a', 'e', 'b'],
['2', 'd', 'X', 'X'],
['3', 'a', 'X', 'X'],
['4', 'd', 'a', 'c'],
And my goal is if a letter from list_alpha is in a sublist of list_beta, then the first element of that line in list_beta (the #) is added to the correct line in list_alpha.
So my output would be:
final_list = [['a', '1', '3', '4'],
['b', '1'],
['c', '4'],
['d', '2', '4'],
['e', '1']]
But I'm pretty new to python and coding in general and I'm not sure how to do this. Is there a way to code this? Or do I have to change the way the data is stored in either list?
Edit:
Changing list_alpha to a dictionary helped!
Final code:
dict_alpha = {'a': [], 'b': [], 'c': [], 'd': [], 'e':[]}
list_beta = [['1', 'a', 'e', 'b'],
['2', 'd', 'X', 'X'],
['3', 'a', 'X', 'X'],
['4', 'd', 'a', 'c'],
['5', 'X', 'X', 'e'],
['6', 'c', 'X', 'X']]
for letter in dict_alpha:
for item in list_beta:
if letter in item:
dict_alpha.get(letter).append(item[0])
print(dict_alpha)

Answer 1

You can use dict_alpha as same as list_alpha , then fix your for loop.
For example:
dict_alpha = [['a'],
['b'],
['c'],
['d'],
['e']]
list_beta = [['1', 'a', 'e', 'b'],
['2', 'd', 'X', 'X'],
['3', 'a', 'X', 'X'],
['4', 'd', 'a', 'c'],
['5', 'X', 'X', 'e'],
['6', 'c', 'X', 'X']]
for al in dict_alpha:
for bt in list_beta:
for i in range(1, len(bt)):
if (bt[i] == al[0]):
al.append(bt[0])
print(dict_alpha)
Output:
[['a', '1', '3', '4'],
['b', '1'],
['c', '4', '6'],
['d', '2', '4'],
['e', '1', '5']]
Hope to helpful!