#17002: Poset is_chain: Trivial simplification
-----------------------------+----------------------------
Reporter: jmantysalo | Owner:
Type: enhancement | Status: new
Priority: trivial | Milestone: sage-6.4
Component: combinatorics | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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A poset is chain if |V|-1=|E|, no vertex has out-degree >1 and no vertex
has in-degree >1. Hence after #16984 code block
{{{
seen_0 = False
for d in self.out_degree():
if d == 1:
pass
elif d == 0:
if seen_0:
return False
seen_0 = True
else:
return False
}}}
can be shortened to be just
{{{
if any(d>1 for d in self.out_degree()):
return False
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/17002>
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