/usr/share/doc/python-tables-doc/examples/objecttree.py is in python-tables-doc 3.2.2-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | from __future__ import print_function
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
# Currently PyTables arrays don't support Unicode strings,
# so we need to make sure we pass plain bytes
array1 = fileh.create_array(
root, "array1", [b"string", b"array"], "String 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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