yearly_consumption = dict({})
"""
{
    "2025": [
        [3.4, 4.6, 3.7, 2.5],
        [...]
    ],
    "2026": [],
}
"""
year = None

def start_new_year(line: str) -> (bool,int|None):
    try:
        year_part = line.strip()[1:].strip()
        int(year_part)
        return (True, year_part)
    except :
        return (False, None)

def convert_line_to_consumpt(line:str) -> [float]:
    line = line.replace(',', '.')
    line = line.split(';')
    values = []
    for txt in line:
        txt = txt.strip()
        values.append(float(txt))
    return values

with open('./verbrauch-2025.csv') as f:
    for line in f.readlines():
        (is_new_year, year_nr) = start_new_year(line)
        print(is_new_year, year_nr)
        if is_new_year:
            year = [] # new list
            yearly_consumption[year_nr] = year
            continue
        year.append( convert_line_to_consumpt(line) )

# debug
print(yearly_consumption)