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To get the bit number of the highest bit set, you could use. int.bit_length()-1 This is much more efficient then using math.log() or the other function you had posted. EDIT: As requested, timeit results are posted: python -m timeit -s 'import math;x=100' 'int(math.log(x,2))' 1000000 loops, best of 3: 0.5 usec per loop
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BetaThe number of the highest bit set is the highest power of 2 less than or equal to the input integer. This is the same as the exponent of the floating point representation of the integer, and is also called its "integer log base 2".(ref.1) In versions before 3.1, the easiest way to determine the highest bit set is*:
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BetaGet Bit: This method is used to find the bit at a particular position ... Python bitwise operators are used to perform bitwise calculations on ... the task is to print the binary representation of the number. Note: The given number will be maximum of 32 bits, so append 0's to the left if the result string is smaller than 30 length ...
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BetaThese two functions compute the orders of the lowest bit and the highest bit set in the binary representation of an integer. I expect them to handle securely very large integer values. python
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BetaYou signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session. You switched accounts on another tab or window.
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BetaHi, I'm using python to develop some proof-of-concept code for a cryptographic application. My code makes extended use of python's native bignum capabilities. In many cryptographic applications there is the need for a function 'get_highest_bit_num' that returns the position number of the highest set bit of a given integer.
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BetaTo answer the second part of your question, you can get specific bit values using bitwise operations # getting your message as int i = int("140900793d002327", 16) # getting bit at position 28 (counting from 0 from right) (i >> 28) & 1 # getting bits at position 24-27 bin((i >> 24) & 0b111)
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BetaIs the goal to get the top aligned byte, or the highest eight bits set? Makes a big difference. – ShadowRanger. Commented Sep 29, 2015 at 3:05. ... return index of least significant bit in Python. 1. Get the x Least Significant Bits from a String in Python. 0. Arbitrary length integer to byte array conversion ...
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BetaThe output isn with its most significant bit set to 0. Test Cases 1 -> 0 2 -> 0 10 -> 2 16 -> 0 100 -> 36 267 -> 11 350 -> 94 500 -> 244 For example: 350 in binary is 101011110. Setting its most significant bit (i.e. the leftmost 1 bit) to 0 turns it into 001011110 which is equivalent to the decimal integer 94, the output.
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Beta3. Use bitwise AND: Finally, we apply the bitwise AND operator (&) between the shifted byte and the mask.This operation will extract only the desired bits, leaving the rest unchanged. Python’s Bitwise Operators and Libraries. Python’s bitwise operators play a significant role in extracting bits from bytes. These operators perform operations at the bit level, allowing us to manipulate ...
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