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from pyhdf.HDF import *
from pyhdf.VS import *
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
vd = vs.attach('INVENTORY', 1) # attach vdata 'INVENTORY' in write mode
# Update the `status' vdata attribute. The attribute length must not
# change. We call the attribute info() method, which returns a list where
# number of values (eg string length) is stored at index 2.
# We then assign a left justified string of exactly that length.
len = vd.attr('status').info()[2]
vd.status = '%-*s' % (len, 'phase 3 done')
# Update record at index 1 (second record)
vd[1] = ('Z4367', 'surprise', 10, 3.1, 44.5)
# Update record at index 4, and those after
vd[4:] = (
('QR231', 'toy', 12, 2.5, 45),
('R3389', 'robot', 3, 45, 2000),
('R3390', 'robot2', 8, 55, 2050)
)
vd.detach() # "close" the vdata
vs.end() # terminate the vdata interface
f.close() # close the HDF file
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