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remove fallback implemenations of combination/permutation functions #771

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merged 1 commit into from
Sep 1, 2024
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remove fallback implemenations of combination/permutation functions #771

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52 changes: 3 additions & 49 deletions pulp/utilities.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
# Utility functions
import itertools
import collections
import itertools
from itertools import combinations as combination
from itertools import permutations as permutation


def resource_clock():
Expand Down Expand Up @@ -32,54 +34,6 @@ def valueOrDefault(x):
return x.valueOrDefault()


def __combination(orgset, k):
"""
fall back if probstat is not installed note it is GPL so cannot
be included
"""
if k == 1:
for i in orgset:
yield (i,)
elif k > 1:
for i, x in enumerate(orgset):
# iterates though to near the end
for s in __combination(orgset[i + 1 :], k - 1):
yield (x,) + s


try: # python >= 3.4
from itertools import combinations as combination
except ImportError:
try: # python 2.7
from itertools import combination
except ImportError: # pulp's
combination = __combination


def __permutation(orgset, k):
"""
fall back if probstat is not installed note it is GPL so cannot
be included
"""
if k == 1:
for i in orgset:
yield (i,)
elif k > 1:
for i, x in enumerate(orgset):
# iterates though to near the end
for s in __permutation(orgset[:i] + orgset[i + 1 :], k - 1):
yield (x,) + s


try: # python >= 3.4
from itertools import permutations as permutation
except ImportError:
try: # python 2.7
from itertools import permutation
except ImportError: # pulp's
permutation = __permutation


def allpermutations(orgset, k):
"""
returns all permutations of orgset with up to k items
Expand Down