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PO
primarykey
Id
12865857
data
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0
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0
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2012-10-12T19:32:03.187
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2014-03-26T15:03:12.973
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2014-03-26T15:03:12.973
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488265
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309483
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2587438
PostTypeId
2
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1
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0
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text
Body
Using the <a href="https://pypi.python.org/pypi/bitarray" rel="nofollow">bitarray module</a>, you can do it a lot quicker for big numbers: Benchmarks (factor 2.4x speedup!): <pre><code>janus@Zeus /tmp % python3 -m timeit -s "import tst" "tst.tst(10000)" 10 loops, best of 3: 251 msec per loop janus@Zeus /tmp % python3 -m timeit -s "import tst" "tst.tst(100)" 1000 loops, best of 3: 700 usec per loop janus@Zeus /tmp % python3 -m timeit -s "import sevenbittoint, os" "sevenbittoint.sevenbittoint(os.urandom(10000))" 10 loops, best of 3: 73.7 msec per loop janus@Zeus /tmp % python3 -m timeit -s "import quick, os" "quick.quick(os.urandom(10000))" 10 loops, best of 3: 179 msec per loop </code></pre> quick.py (from Mark Byers): <pre><code>def quick(bites): i = 0 for b in bites: i <<= 7 i += (b & 0x7f) #i += b return i </code></pre> sevenbittoint.py: <pre><code>import bitarray import functools def inttobitarray(x): a = bitarray.bitarray() a.frombytes(x.to_bytes(1,'big')) return a def concatter(accumulator,thisitem): thisitem.pop(0) for i in thisitem.tolist(): accumulator.append(i) return accumulator def sevenbittoint(bajts): concatted = functools.reduce(concatter, map(inttobitarray, bajts), bitarray.bitarray()) missingbits = 8 - len(concatted) % 8 for i in range(missingbits): concatted.insert(0,0) # zeropad return int.from_bytes(concatted.tobytes(), byteorder='big') def tst(): num = 32768 print(bin(num)) print(sevenbittoint(num.to_bytes(2,'big'))) if __name__ == "__main__": tst() </code></pre> tst.py: <pre><code>import os import quick import sevenbittoint def tst(sz): bajts = os.urandom(sz) #for i in range(pow(2,16)): # if i % pow(2,12) == 0: print(i) # bajts = i.to_bytes(2, 'big') a = quick.quick(bajts) b = sevenbittoint.sevenbittoint(bajts) if a != b: raise Exception((i, bin(int.from_bytes(bajts,'big')), a, b)) </code></pre>
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1. This table or related slice is empty.
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1. POWorking with bytes and binary data in Python
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USJonas Gröger
UserOwnerUserId
1. USJanus Troelsen
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