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from pyhdf.HDF import *
from pyhdf.VS import *
# Open HDF file and initialize the VS interface
f = HDF('inventory.hdf', # Open file 'inventory.hdf' in write mode
HC.WRITE|HC.CREATE) # creating it if it does not exist
vs = f.vstart() # init vdata interface
# Create vdata and define its structure
vd = vs.create( # create a new vdata
'INVENTORY', # name of the vdata
# fields of the vdata follow
(('partid',HC.CHAR8, 5), # 5 char string
('description',HC.CHAR8, 10), # 10 char string field
('qty',HC.INT16, 1), # 1 16 bit int field
('wght',HC.FLOAT32, 1), # 1 32 bit float
('price',HC.FLOAT32,1) # 1 32 bit float
)) # 5 fields allocated in the vdata
# Set attributes on the vdata and its fields
vd.field('wght').unit = 'lb'
vd.field('price').unit = '$'
# In order to be able to update a string attribute, it must
# always be set to the same length. This sets 'status' to a 20
# char long, left-justified string, padded with spaces on the right.
vd.status = "%-20s" % 'phase 1 done'
# Store records
vd.write(( # write 3 records
('Q1234', 'bolt',12, 0.01, 0.05), # record 1
('B5432', 'brush', 10, 0.4, 4.25), # record 2
('S7613', 'scissor', 2, 0.2, 3.75) # record 3
))
vd.detach() # "close" the vdata
vs.end() # terminate the vdata interface
f.close() # close the HDF file
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