Группировка списка по неделям

lst = [["2022-07-15", 1, 2, 3], ["2022-07-15", 2, 3, 4], ["2022-06-29", 1, 2, 3], ["2022-07-07", 2, 3, 4]]

>> [["2022-07-11", 3, 5, 7], ["2022-06-27", 1, 2, 3], ["2022-07-04", 2, 3, 4]]

>> [["2022-07", 5, 8, 11], ["2022-06", 1, 2, 3]]

import datetime
 
data = [["2022-07-15", 1, 2, 3], ["2022-07-15", 2, 3, 4], ["2022-06-29", 1, 2, 3], ["2022-07-07", 2, 3, 4]]
 
# Добавляем номер недели в список
for i in data:
    date = i[0].split("-")
    year, month, day = date
    i.append(datetime.date(int(year), int(month), int(day)).isocalendar()[1])
 
res = []
for i in data:
    for j in res:
        if i[4] == j[4]:
            j[1] += i[1]
            j[2] += i[2]
            j[3] += i[3]
            break
    else:
        res.append(i)
 
print(res)

from datetime import datetime, timedelta
from itertools import groupby
 
lst = [["2022-07-15", 1, 2, 3], ["2022-07-15", 2, 3, 4], ["2022-06-29", 1, 2, 3], ["2022-07-07", 2, 3, 4]]
lst = sorted(lst, key=lambda x: x[0])
 
def get_fdow(d_str):
    dt = datetime.strptime(d_str, '%Y-%m-%d').date()    
    w_start = str(dt - timedelta(days=dt.weekday()))
    return w_start
 
def get_fdom(d_str):
    dt = datetime.strptime(d_str, '%Y-%m-%d').date()
    return dt.strftime('%Y-%m')
 
def group_elements(group_func):
    new_lst = []                                            
    for k, g in groupby(lst, key=lambda x: group_func(x[0])): 
        sub = [k]                                           
        for x in zip(*(x[1:] for x in g)):                  
            sub.append(sum(x))                              
        new_lst.append(sub)
    return new_lst
 
print(group_elements(get_fdow))
print(group_elements(get_fdom))