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author | Raymond Hettinger <python@rcn.com> | 2013-10-06 04:48:21 (GMT) |
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committer | Raymond Hettinger <python@rcn.com> | 2013-10-06 04:48:21 (GMT) |
commit | 8fe47c399174d007937c54e1fc9eb0efd2b324e9 (patch) | |
tree | 25169b859fd147a688fb991800b12526abde7a18 /Lib/random.py | |
parent | 81a93159d7a4bfc6a6d06f44528d9d17a8c634c2 (diff) | |
download | cpython-8fe47c399174d007937c54e1fc9eb0efd2b324e9.zip cpython-8fe47c399174d007937c54e1fc9eb0efd2b324e9.tar.gz cpython-8fe47c399174d007937c54e1fc9eb0efd2b324e9.tar.bz2 |
Minor clean-up of function parameters in random().
Diffstat (limited to 'Lib/random.py')
-rw-r--r-- | Lib/random.py | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/Lib/random.py b/Lib/random.py index 5876766..35e5b4a 100644 --- a/Lib/random.py +++ b/Lib/random.py @@ -162,18 +162,17 @@ class Random(_random.Random): ## -------------------- integer methods ------------------- - def randrange(self, start, stop=None, step=1, int=int): + def randrange(self, start, stop=None, step=1, _int=int): """Choose a random item from range(start, stop[, step]). This fixes the problem with randint() which includes the endpoint; in Python this is usually not what you want. - Do not supply the 'int' argument. """ # This code is a bit messy to make it fast for the # common case while still doing adequate error checking. - istart = int(start) + istart = _int(start) if istart != start: raise ValueError("non-integer arg 1 for randrange()") if stop is None: @@ -182,7 +181,7 @@ class Random(_random.Random): raise ValueError("empty range for randrange()") # stop argument supplied. - istop = int(stop) + istop = _int(stop) if istop != stop: raise ValueError("non-integer stop for randrange()") width = istop - istart @@ -192,7 +191,7 @@ class Random(_random.Random): raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width)) # Non-unit step argument supplied. - istep = int(step) + istep = _int(step) if istep != step: raise ValueError("non-integer step for randrange()") if istep > 0: @@ -251,7 +250,7 @@ class Random(_random.Random): raise IndexError('Cannot choose from an empty sequence') return seq[i] - def shuffle(self, x, random=None, int=int): + def shuffle(self, x, random=None): """x, random=random.random -> shuffle list x in place; return None. Optional arg random is a 0-argument function returning a random @@ -260,11 +259,18 @@ class Random(_random.Random): Do not supply the 'int' argument. """ - randbelow = self._randbelow - for i in reversed(range(1, len(x))): - # pick an element in x[:i+1] with which to exchange x[i] - j = randbelow(i+1) if random is None else int(random() * (i+1)) - x[i], x[j] = x[j], x[i] + if random is None: + randbelow = self._randbelow + for i in reversed(range(1, len(x))): + # pick an element in x[:i+1] with which to exchange x[i] + j = randbelow(i+1) + x[i], x[j] = x[j], x[i] + else: + _int = int + for i in reversed(range(1, len(x))): + # pick an element in x[:i+1] with which to exchange x[i] + j = _int(random() * (i+1)) + x[i], x[j] = x[j], x[i] def sample(self, population, k): """Chooses k unique random elements from a population sequence or set. |