Function read_field

bench/table-bench.py:246–276

(filename, field, rng, verbose)

def read_field(filename, field, rng, verbose):
    fileh = tb.open_file(filename, mode="r")
    rowsread = 0
    if rng is None:
        rng = [0, -1, 1]
    if field == "all":
        field = None
    for groupobj in fileh.walk_groups(fileh.root):
        for table in fileh.list_nodes(groupobj, "Table"):
            rowsize = table.rowsize
            # table.nrowsinbuf = 3 # For testing purposes
            if verbose:
                print("Max rows in buf:", table.nrowsinbuf)
                print("Rows in", table._v_pathname, ":", table.nrows)
                print("Buffersize:", table.rowsize * table.nrowsinbuf)
                print("MaxTuples:", table.nrowsinbuf)
                print(
                    "(field, start, stop, step) ==>",
                    (field, rng[0], rng[1], rng[2]),
                )

            e = table.read(rng[0], rng[1], rng[2], field)

            rowsread += table.nrows
            if verbose:
                print("Selected rows ==> ", e)
                print("Total selected rows ==> ", len(e))

    # Close the file (eventually destroy the extended type)
    fileh.close()
    return (rowsread, rowsize)


if __name__ == "__main__":