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Use ABCs to validate documented restriction to Sets or Sequences.

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This commit is contained in:
Raymond Hettinger 2009-02-24 11:27:15 +00:00
parent 9aa53c2f01
commit 886687dcda
1 changed files with 4 additions and 3 deletions
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7
Lib/random.py
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@ -43,6 +43,7 @@
from math import sqrt as _sqrt, acos as _acos, cos as _cos, sin as _sin
from os import urandom as _urandom
from binascii import hexlify as _hexlify
import collections as _collections
__all__ = ["Random","seed","random","uniform","randint","choice","sample",
"randrange","shuffle","normalvariate","lognormvariate",
@ -296,10 +297,10 @@ def sample(self, population, k):
# preferred since the list takes less space than the
# set and it doesn't suffer from frequent reselections.
if isinstance(population, (set, frozenset)):
if isinstance(population, _collections.Set):
population = tuple(population)
if not hasattr(population, '__getitem__') or hasattr(population, 'keys'):
raise TypeError("Population must be a sequence or set. For dicts, use dict.keys().")
if not isinstance(population, _collections.Sequence):
raise TypeError("Population must be a sequence or Set. For dicts, use list(d).")
random = self.random
n = len(population)
if not 0 <= k <= n: