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bmribler
7f83faf9d9
These examples are referred to from the replacement page of https://portal.hdfgroup.org/display/HDF5/Other+Examples.
72 lines
2.0 KiB
Python
72 lines
2.0 KiB
Python
#
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# This example demonstrates the concepts of hard, soft and external links.
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#
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# We will create file links.h5 with the following members and then will try to access objects
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# using hard, soft and external links.
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# / Group
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# /A Group
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# /A/a Dataset {10}
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# /B Group
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# /B/External External Link {dset.h5//dset}
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# /a Dataset, same as /A/a
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# /dangling Soft Link {/B/XXX}
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# /soft Soft Link {/A/a}
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import h5py
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import numpy as np
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file = h5py.File('links.h5', 'w')
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#
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# Create a group structure in the file
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#
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A = file.create_group("A")
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B = file.create_group("B")
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a = A.create_dataset("a", (10,), 'i')
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#
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# Create a hard link in a root group pointing to dataset /A/a
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#
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file["a"] = a
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#
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# Create a soft link (alias) in a root group with a value /A/a
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#
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file["soft"] = h5py.SoftLink('/A/a')
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#
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# Create a soft link (alias) in a root group with a value /B/XXX that cannot be resolved
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#
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file["dangling"] = h5py.SoftLink('/B/XXX')
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#
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# Create an external link to a dataset "dset" in file dset.h5
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#
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B['External'] = h5py.ExternalLink("dset.h5", "/dset")
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#
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# List objects in the root group in the file
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#
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print("Root group members in links.h5:")
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try:
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print("Trying to get the items...")
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print(list(file.items()))
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except:
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print("...but can only get the keys...")
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print(list(file.keys()))
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print(" ")
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print("Why? Because the library cannot resolve the dangling link.")
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print("We will delete the 'dangling' link and try again.")
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del file["dangling"]
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print(list(file.items()))
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print(" ")
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print("Group A members:")
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print(list(A.items()))
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print(" ")
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print("Group B members:")
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print(list(B.items()))
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print(" ")
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print("Reading dataset pointed by the external link...")
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dset = B['External']
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data = np.zeros((4,6))
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data = dset[...]
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print(data)
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#
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# Copy link to /A/a to /B/b
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#
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B["b"]=A["a"]
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file.close()
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