def read_symbols(file_name):
    """Read stock symbols from file
    Args:
      file_name: (string) input file name.
    """
    symbols_list = []
    with open(file_name, 'r') as infile:
        for line in infile.readlines():
            str_line = str(line).strip()
            if str_line:
                symbols_list.append(str_line)
    return symbols_list