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Building on Caridorc's answer, there's a more Pythonic way to approach the problem which has an even better readability:

def reverse(string):
 return ''.join(string[i] for i in reversed(range(len(string))

Here's an explanation from furthest depth outward:

1. range(len(string)): Create an iterator object which iterates from 0 to len(string) - 1 (ie: the parameter is non-inclusive).
2. reversed(range(len(string))): Reverse this iterator so you're starting at len(string) - 1 and going backward one-by-one to 0.
3. [string[i] for i in ...]: This is a list comprehension, basically a way to create a list with a single line.
4. ''.join(...): Join each element together into a string from the list, using an empty string as a separator.

Documentation can be found for each of these concepts here:

1. PEP 281: loop counters with range and xrange.
2. PEP 322: reversed iteration.
3. PEP 202: list comprehensions.

The hope is that the above code will be fairly readable to someone nominally proficient in Python.

Building on Caridorc's answer, there's a more Pythonic way to approach the problem which has an even better readability:

def reverse(string):
 return ''.join(string[i] for i in reversed(range(len(string))

Here's an explanation from furthest depth outward:

1. range(len(string)): Create an iterator object which iterates from 0 to len(string) - 1 (ie: the parameter is non-inclusive).
2. reversed(range(len(string))): Reverse this iterator so you're starting at len(string) - 1 and going backward one-by-one to 0.
3. [string[i] for i in ...]: This is a list comprehension, basically a way to create a list with a single line.
4. ''.join(...): Join each element together into a string from the list, using an empty string as a separator.

Documentation can be found for each of these concepts here:

1. PEP 281: loop counters with range and xrange.
2. PEP 322: reversed iteration.
3. PEP 202: list comprehensions.

The hope is that the above code will be fairly readable to someone nominally proficient in Python.

Building on Caridorc's answer, there's a more Pythonic way to approach the problem which has an even better readability:

def reverse(string):
 return ''.join(string[i] for i in reversed(xrange(len(string))

Here's an explanation from furthest depth outward:

1. xrange(len(string)): Create an iterator object which iterates from 0 to len(string) - 1 (ie: the parameter is non-inclusive).
2. reversed(xrange(len(string))): Reverse this iterator so you're starting at len(string) - 1 and going backward one-by-one to 0.
3. [string[i] for i in ...]: This is a list comprehension, basically a way to create a list with a single line.
4. ''.join(...): Join each element together into a string from the list, using an empty string as a separator.

Documentation can be found for each of these concepts here:

1. PEP 281: loop counters with range and xrange.
2. PEP 322: reversed iteration.
3. PEP 202: list comprehensions.

The hope is that the above code will be fairly readable to someone nominally proficient in Python.

Building on Caridorc's answer, there's a more Pythonic way to approach the problem which has an even better readability:

def reverse(string):
 return ''.join(string[i] for i in reversed(range(len(string))

Here's an explanation from furthest depth outward:

1. range(len(string)): Create an iterator object which iterates from 0 to len(string) - 1 (ie: the parameter is non-inclusive).
2. reversed(range(len(string))): Reverse this iterator so you're starting at len(string) - 1 and going backward one-by-one to 0.
3. [string[i] for i in ...]: This is a list comprehension, basically a way to create a list with a single line.
4. ''.join(...): Join each element together into a string from the list, using an empty string as a separator.

Documentation can be found for each of these concepts here:

1. PEP 281: loop counters with range and xrange.
2. PEP 322: reversed iteration.
3. PEP 202: list comprehensions.

The hope is that the above code will be fairly readable to someone nominally proficient in Python.