While the built-in bin() function in Python is a convenient way to convert an integer to binary, sometimes it’s useful to know alternative methods as well. Using ‘’ format specifier or the str.format() function, converting a binary string back to an integer using the int() function with base 2, and using the int.to_bytes() method to convert an integer to bytes. How to Convert Number to Binary In Python (bin() Function) To keep leading zeros in the binary string, we can specify the desired width using the width parameter of the format() function. The '#' option adds the prefix 0b to the binary string, which we need to remove by slicing the string from the 3rd position ( ). We then use the format() function with the option '#b' to convert num to a binary string. In this code snippet, we first define the input integer num. Using the format() function with the option ‘#b’Īnother way to convert an integer to binary in Python is to use the format() function with the option '#b'. It’s worth noting that this method has a time complexity of O(log n), where n is the input integer. This will output 1010, which is the binary equivalent of the decimal number 10. We can then print the elements of the returned list to get the binary equivalent. To get the binary equivalent of an integer, we can call the int_to_binary() function and pass the input integer as an argument. Finally, we reverse the binary list and return it. We repeat this process until the input integer becomes 0. We then use a while loop to divide the input integer by 2 and append the remainder to the binary list. If you are putting the result in a larger string, use an formatted string literal (3.6+) or use str.format() and put the second argument for the format() function after the colon of the placeholder '", "v = 14")īut I'd use that only if performance in a tight loop matters, as format(.) communicates the intent better.In this code snippet, we first initialize an empty list called binary. This is the most compact and direct option. The # makes the format include the 0b prefix, and the 010 size formats the output to fit in 10 characters width, with 0 padding 2 characters for the 0b prefix, the other 8 for the binary digits. The format() function simply formats the input following the Format Specification mini language. Use the format() function: > format(14, '#010b')
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