42 lines
1.1 KiB
Python
42 lines
1.1 KiB
Python
"""Library to generate random numbers
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Warning! Don't use this for anything important, it's probably biased
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"""
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___license___ = "MIT"
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# todo: simplify this by using "urandom"
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import os
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_bigrand_bytes = 10
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_bigrand_max = pow(256, _bigrand_bytes)
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def _bigrand():
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"""generates a random number between 0 (incl) and _bigrand_max (excl)"""
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base = 0
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for b in os.urandom(_bigrand_bytes):
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base = (base << 8) + b
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return base
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def random():
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"""Return the next random floating point number in the range [0.0, 1.0)."""
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return _bigrand() / _bigrand_max
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def randrange(start, stop=None):
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"""Return a randomly selected element from range(start, stop)"""
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if stop is None:
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stop = start
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start = 0
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return start + (_bigrand() * (stop - start) // _bigrand_max)
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def randint(start, stop):
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"""Return a random integer N such that a <= N <= b."""
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return randrange(start, stop + 1)
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def shuffle(seq):
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"""Shuffle the sequence x in place."""
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l = len(seq)
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for i in range(l):
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j = randrange(l)
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seq[i], seq[j] = seq[j], seq[i]
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