将日期时间列表转换为包含特定年份和月份的日期时间计数的列表列表

def convert_datetime_list(datetime_list):
    result = []
    
    for datetime in datetime_list:
        year = datetime.year
        month = datetime.month
        
        # Check if year exists in result
        year_exists = False
        for item in result:
            if item[0] == year:
                year_exists = True
                year_index = result.index(item)
                break
        
        if year_exists:
            # Check if month exists in year's list
            month_exists = False
            for count in result[year_index][1:]:
                if count[0] == month:
                    month_exists = True
                    month_index = result[year_index].index(count)
                    break
            
            if month_exists:
                # Increment month count
                result[year_index][month_index][1] += 1
            else:
                # Add new month count
                result[year_index].append([month, 1])
        else:
            # Add new year and month count
            result.append([year, [month, 1]])
    
    return result