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#!/usr/bin/env python3
# Copyright (C) 2005-2007 Carabos Coop. V. All rights reserved
# Copyright (C) 2008-2024 Vicent Mas. All rights reserved
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author: Vicent Mas - vmas@vitables.org
#
# This script is based on a set of scripts by Francesc Alted.
"""Sample of a typical object tree."""
import tables
class Particle(tables.IsDescription):
identity = tables.StringCol(itemsize=22, dflt=" ", pos=0) # character String
idnumber = tables.Int16Col(dflt=1, pos = 1) # short integer
speed = tables.Float32Col(dflt=1, pos = 1) # single-precision
# Open a file in "w"rite mode
fileh = tables.open_file("objecttree.h5", mode = "w")
# Get the HDF5 root group
root = fileh.root
# Create the groups:
group1 = fileh.create_group(root, "group1")
group2 = fileh.create_group(root, "group2")
# Now, create an array in root group
array1 = fileh.create_array(root, "array1",
[bytes("string", encoding="utf-8"), bytes("array", encoding="utf-8")], "Data array")
# Create 2 new tables in group1
table1 = fileh.create_table(group1, "table1", Particle)
table2 = fileh.create_table("/group2", "table2", Particle)
# Create the last table in group2
array2 = fileh.create_array("/group1", "array2", [1,2,3,4])
# Now, fill the tables:
for table in (table1, table2):
# Get the record object associated with the table:
row = table.row
# Fill the table with 10 records
for i in range(10):
# First, assign the values to the Particle record
row['identity'] = 'This is particle: %2d' % (i)
row['idnumber'] = i
row['speed'] = i * 2.
# This injects the Record values
row.append()
# Flush the table buffers
table.flush()
# Finally, close the file (this also will flush all the remaining buffers!)
fileh.close()
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