Create nested list from list in python

Need to get nested lists from the list in python

list_values=[('BNB', '161221'),
 ('BNB', '171221'),
 ('BNB', '241221'),
 ('BNB', '280122'),
 ('BNB', '311221'),
 ('BTC', '161221'),
 ('BTC', '171221'),
 ('BTC', '241221'),
 ('BTC', '250222'),
 ('BTC', '250322'),
 ('BTC', '280122'),
 ('BTC', '311221')]

The output of lists needed is

List_op=[[('BNB', '161221'),
 ('BNB', '171221'),
 ('BNB', '241221'),
 ('BNB', '280122'),
 ('BNB', '311221')],
[('BTC', '161221'),
 ('BTC', '171221'),
 ('BTC', '241221'),
 ('BTC', '250222'),
 ('BTC', '250322'),
 ('BTC', '280122'),
 ('BTC', '311221')]]

I have tried with some list comprehension methods, but couldnt get this. Help is appreciated.

>Solution :

A simple solution:

from collections import defaultdict

list_values = [
    ('BNB', '161221'),
    ('BNB', '171221'),
    ('BNB', '241221'),
    ('BNB', '280122'),
    ('BNB', '311221'),
    ('BTC', '161221'),
    ('BTC', '171221'),
    ('BTC', '241221'),
    ('BTC', '250222'),
    ('BTC', '250322'),
    ('BTC', '280122'),
    ('BTC', '311221')
]

# a dict might be a better data type here
result = defaultdict(list)
for k, v in list_values:
    result[k].append(v)
print(result)

# but if you need a list of lists instead of a dictionary:
result = defaultdict(list)
for k, v in list_values:
    result[k].append((k, v))
list_op = [*result.values()]
print(list_op)

Output:

defaultdict(<class 'list'>, {'BNB': ['161221', '171221', '241221', '280122', '311221'], 'BTC': ['161221', '171221', '241221', '250222', '250322', '280122', '311221']})
[[('BNB', '161221'), ('BNB', '171221'), ('BNB', '241221'), ('BNB', '280122'), ('BNB', '311221')], [('BTC', '161221'), ('BTC', '171221'), ('BTC', '241221'), ('BTC', '250222'), ('BTC', '250322'), ('BTC', '280122'), ('BTC', '311221')]]