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################################
#
# Sample Python Script
#
# Illustrates the traversal and manipulation of an entire packet tree.
#
# See the file "tree.session" for the results of running this script.
#
################################
# Create a new census of finite orientable closed 3-manifold
# triangulations with two tetrahedra.
from regina import NBoolSet
census = regina.NContainer()
regina.NCensus.formCensus(census, 2, NBoolSet.sTrue,
NBoolSet.sTrue, NBoolSet.sFalse, 0, 0)
# Calculate the homology of each triangulation in the census.
# Note that formCensus() will have inserted each new triangulation as
# a child packet of the overall census container.
tri = census.getFirstTreeChild()
while tri != None:
print tri.getPacketLabel() + ":", tri.getHomologyH1()
tri = tri.getNextTreeSibling()
# Remove from the tree each triangulation with trivial homology.
tri = census.getFirstTreeChild()
while tri != None:
next = tri.getNextTreeSibling()
hom = tri.getHomologyH1()
if hom.isTrivial():
tri.makeOrphan()
tri = next
# Print the homology of each remaining triangulation.
tri = census.getFirstTreeChild()
while tri != None:
print tri.getPacketLabel() + ":", tri.getHomologyH1()
tri = tri.getNextTreeSibling()
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