/usr/share/doc/python-tables/examples/links.py is in python-tables-doc 3.4.2-4.
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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 as tb
# Create a new file with some structural groups
f1 = tb.open_file('links1.h5', 'w')
g1 = f1.create_group('/', 'g1')
g2 = f1.create_group(g1, 'g2')
# Create some datasets
a1 = f1.create_carray(g1, 'a1', tb.Int64Atom(), shape=(10000,))
t1 = f1.create_table(g2, 't1', {'f1': tb.IntCol(), 'f2': tb.FloatCol()})
# Create new group and a first hard link
gl = f1.create_group('/', 'gl')
ht = f1.create_hard_link(gl, 'ht', '/g1/g2/t1') # ht points to t1
print("``%s`` is a hard link to: ``%s``" % (ht, t1))
# Remove the orginal link to the t1 table
t1.remove()
print("table continues to be accessible in: ``%s``" % f1.get_node('/gl/ht'))
# Let's continue with soft links
la1 = f1.create_soft_link(gl, 'la1', '/g1/a1') # la1 points to a1
print("``%s`` is a soft link to: ``%s``" % (la1, la1.target))
lt = f1.create_soft_link(gl, 'lt', '/g1/g2/t1') # lt points to t1 (dangling)
print("``%s`` is a soft link to: ``%s``" % (lt, lt.target))
# Recreate the '/g1/g2/t1' path
t1 = f1.create_hard_link('/g1/g2', 't1', '/gl/ht')
print("``%s`` is not dangling anymore" % (lt,))
# Dereferrencing
plt = lt()
print("dereferred lt node: ``%s``" % plt)
pla1 = la1()
print("dereferred la1 node: ``%s``" % pla1)
# Copy the array a1 into another file
f2 = tb.open_file('links2.h5', 'w')
new_a1 = a1.copy(f2.root, 'a1')
f2.close() # close the other file
# Remove the original soft link and create an external link
la1.remove()
la1 = f1.create_external_link(gl, 'la1', 'links2.h5:/a1')
print("``%s`` is an external link to: ``%s``" % (la1, la1.target))
new_a1 = la1() # dereferrencing la1 returns a1 in links2.h5
print("dereferred la1 node: ``%s``" % new_a1)
print("new_a1 file:", new_a1._v_file.filename)
f1.close()
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