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Added new test "3sort". This is sorted data but with 3 random exchanges. 

It's a little better than average for our sort.
This commit is contained in:
Tim Peters 2002-07-20 04:21:51 +00:00
parent 1cfcafceb6
commit 0a30e648e0
1 changed files with 9 additions and 1 deletions
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10
Lib/test/sortperf.py
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@ -74,12 +74,13 @@ def tabulate(r):
*sort: random data
\sort: descending data
/sort: ascending data
3sort: ascending data but with 3 random exchanges
~sort: many duplicates
=sort: all equal
!sort: worst case scenario
"""
cases = ("*sort", "\\sort", "/sort", "~sort", "=sort", "!sort")
cases = ("*sort", "\\sort", "/sort", "3sort", "~sort", "=sort", "!sort")
fmt = ("%2s %7s" + " %6s"*len(cases))
print fmt % (("i", "2**i") + cases)
for i in r:
@ -92,6 +93,13 @@ def tabulate(r):
doit(L) # \sort
doit(L) # /sort
# Do 3 random exchanges.
for dummy in range(3):
i1 = random.randrange(n)
i2 = random.randrange(n)
L[i1], L[i2] = L[i2], L[i1]
doit(L) # 3sort
# Arrange for lots of duplicates.
if n > 4:
del L[4:]