import csv


def opencsv(filename):
    """
    Open a csv file and return the content as a list of lists.
    Args:
        filename (str): path to the csv file.
    Returns:
        list: list of lists containing the content of the csv file.
    """
    file = open(filename)
    csvreader = csv.reader(file)
    header = []
    header = next(csvreader)
    rowstrain = []
    rows = []
    for row in csvreader:
        rows.append(row)
    return rows