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Benjamin Bandt-Horn

BitwiseOperators - Python Wiki - 0 views

wiki.python.org/...BitwiseOperators

python bitwise

shared by Benjamin Bandt-Horn on 15 Dec 13 - No Cached
  • x << yReturns x with the bits shifted to the left by y places (and new bits on the right-hand-side are zeros). This is the same as multiplying x by 2**y.
  • x >> yReturns x with the bits shifted to the right by y places. This is the same as //'ing x by 2**y.
  • x & yDoes a "bitwise and". Each bit of the output is 1 if the corresponding bit of x AND of y is 1, otherwise it's 0.
  • ...5 more annotations...
  • x ^ yDoes a "bitwise exclusive or". Each bit of the output is the same as the corresponding bit in x if that bit in y is 0, and it's the complement of the bit in x if that bit in y is 1.
  • x | yDoes a "bitwise or". Each bit of the output is 0 if the corresponding bit of x AND of y is 0, otherwise it's 1.
  • ~ x Returns the complement of x - the number you get by switching each 1 for a 0 and each 0 for a 1. This is the same as -x - 1.
  • Just remember about that infinite series of 1 bits in a negative number, and these should all make sense.
  • One more point: Python allows operator overloading, so some classes may be written to allow the bitwise operators, but with some other meaning. For instance, the new sets module for Python 2.3 uses | and & for union and intersection.
  • Benjamin Bandt-Horn on 15 Dec 13
     
    The Operators: x << y Returns x with the bits shifted to the left by y places (and new bits on the right-hand-side are zeros). This is the same as multiplying x by 2**y.
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