May 31, 2009 · Reversing part of a string in Python. 0. Reversing characters in a python string. 0. Reverse the given ...

Aug 9, 2015 · What is the best way to loop over a python string backwards? The following seems a little awkward for all the need of -1 offset: string = "trick or treat" for i in range(len(string)-1, 0-1, -1): print string[i] The following seems more succinct, but is it actually generate a reversed string so that there is a minor performance penalty?

Additionally, Python imposes a limit on stack size, and there's no tail call optimization, so a recursive solution would be limited to reversing strings of only about a thousand characters. You can increase Python's stack size, but there would still be a fixed limit, while other solutions can always handle a string of any length.

Nov 13, 2016 · Let's say I have a string stored in a variable: a = 'Python' Now, a[2:4] returns th. How do I reverse this part of the string so that I get ht returned instead? This is what I tried: print a[2:4:-1] But this returned an empty string. Now I know that I can simply store the result of a[2:4] in a new variable and reverse that new variable. But is ...

The "-1" part represents the "step" part of the slicing—in this case, it goes through the string 1 character at a time, but backwards (a negative step means start from the end of the string). If you specify the step to be 2, for instance, you would get every other character of the string, starting with the first one.

Oct 15, 2010 · Note: Dec, 2023 with Python 3.11 performance improvements. I ran a quick comparison of Python 3.7 to 3.11 (on the same PC just now) with 1 million cycles to see what difference the the 3.11 performance improvements would make. Python 3.11 was 26.5% faster on average, roughly the same for manual as for built in methods of reversing lists.

Here is a function based on the best, fastest, and most Pythonic answer above and in current Python 3 syntax: def reverse_hex(hex_string): if isinstance(hex_string, str): input_is_string = True hex_string = hex_string.encode() a = array.array('H', hex_string) a.reverse() output = a.tobytes() if input_is_string: return output.decode() else ...

Jun 26, 2023 · If you look at Python's intermediate code (see Godbolt Compiler Explorer), you can also see that slicing is its own operation, so it's pretty much optimized as well. So, s[::-1] is the recommended way to reverse a string in Python because of its combination of efficiency, readability, and idiomatic Python style.

Dec 25, 2016 · Python string is not mutable, so you can not use the del statement to remove characters in place. However you can build up a new string while looping through the original one: However you can build up a new string while looping through the original one:

Feb 7, 2019 · def reverse_pos(string): for elm in string.split(): k = '' # temporar string that holds the reversed strings for j in elm: k = j + k yield k string = 'This is the string' print(' '.join(reverse_pos(string))) Output: sihT si eht gnirts NB: The main idea here is split by spaces and reverse each elmement. This will reverse and keep the words in ...