Bits list to integer in python

Converting a list of bits to an integer is a common task in Python. There are several ways to achieve this, each with its own advantages and disadvantages. In this article, we will explore three different approaches to solve this problem.

Approach 1: Using the built-in int() function

The simplest way to convert a list of bits to an integer is by using the built-in int() function. This function takes two arguments: the string representation of the bits and the base, which in this case is 2 for binary.

bits = [1, 0, 1, 1, 0, 1]
bit_string = ''.join(str(bit) for bit in bits)
result = int(bit_string, 2)
print(result)

In this code snippet, we first convert the list of bits to a string by joining each bit with an empty string. Then, we pass this string to the int() function along with the base 2. The resulting integer is stored in the result variable and printed.

Approach 2: Using bitwise operations

Another way to convert a list of bits to an integer is by using bitwise operations. We can iterate over the bits in reverse order and use the bitwise OR operator (|) to set the corresponding bit in the result.

bits = [1, 0, 1, 1, 0, 1]
result = 0
for bit in bits[::-1]:
    result = (result << 1) | bit
print(result)

In this code snippet, we initialize the result variable to 0. Then, for each bit in the reversed list of bits, we shift the result one position to the left using the bitwise left shift operator (<<) and set the least significant bit to the current bit using the bitwise OR operator. Finally, we print the resulting integer.

Approach 3: Using the reduce() function

The third approach involves using the reduce() function from the functools module. This function applies a function of two arguments cumulatively to the items of a sequence, from left to right, so as to reduce the sequence to a single value.

from functools import reduce

bits = [1, 0, 1, 1, 0, 1]
result = reduce(lambda x, y: (x << 1) | y, bits)
print(result)

In this code snippet, we import the reduce() function from the functools module. Then, we pass a lambda function to reduce() that performs the same bitwise operations as in approach 2. The resulting integer is stored in the result variable and printed.

After exploring these three approaches, it is clear that the first approach using the built-in int() function is the simplest and most straightforward. It requires fewer lines of code and is easier to understand. Therefore, the first approach is the better option for converting a list of bits to an integer in Python.

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12 Responses

  1. Approach 2 using bitwise operations may be faster, but Approach 3 using reduce() seems more elegant. Thoughts? 🤔

    1. I agree! Using bitwise operations to convert bits to integers not only adds a touch of geekiness, but it also showcases the power of low-level programming. Its amazing how a simple manipulation of bits can yield such fascinating results. #nerdlife

  2. Approach 1 seems too easy, wheres the challenge? Approach 2 looks intriguing, lets dive into those bitwise operations! #Python

    1. I cant believe you didnt know about this already! 😱 Bitwise operations are a fundamental concept in programming, especially in Python. Its great that youre finally catching up, but dont act like its some mind-blowing revelation. Keep learning!

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