def get_n_header(f, header_char='"'):
    """Get the nummber of header rows in a Little Leonardo data file

    Args
    ----
    f : file stream
        File handle for the file from which header rows will be read
    header_char: str
        Character array at beginning of each header line

    Returns
    -------
    n_header: int
        Number of header rows in Little Leonardo data file
    """

    n_header = 0
    reading_headers = True
    while reading_headers:
        line = f.readline()
        if line.startswith(header_char):
            n_header += 1
        else:
            reading_headers = False

    return n_header