def open_many(filenames):
dfs = []<EOL>for filename in filenames:<EOL><INDENT>filename = filename.strip()<EOL>if filename and filename[<NUM_LIT:0>] != "<STR_LIT:#>":<EOL><INDENT>dfs.append(open(filename))<EOL><DEDENT><DEDENT>return vaex.dataframe.DataFrameConcatenated(dfs=dfs)<EOL>
Open a list of filenames, and return a DataFrame with all DataFrames cocatenated.

    :param list[str] filenames: list of filenames/paths
    :rtype: DataFrame