Знаки в сумме 7+7+7+7+7+7 = 7

def get_sum(list_of_char, number):
    s = 0
    for ch in list_of_char:
        s += int(ch + str(number))
    return s
'''
list_of_char = ['+','+','+','+','+','+']
number = 7
print(get_sum(list_of_char, number))
'''
def  brute_force():
    number = 7
    list_of_oper = ['+','-']
    list_of_char = []
    for ch_1 in list_of_oper:
        for ch_2 in list_of_oper:
            for ch_3 in list_of_oper:
                for ch_4 in list_of_oper:
                    for ch_5 in list_of_oper:
                        for ch_6 in list_of_oper:
                            list_of_char.extend([ch_1, ch_2, ch_3, ch_4, ch_5, ch_6])

                            print('Результат: ',get_sum(list_of_char, number))
                            list_of_char = []
brute_force()