Python: Revere string

Probably the easiest and close to the fastest way to reverse a string is to use Python’s extended slice syntax. This allows you to specify a start, stop and step value to use when creating a slice. The syntax is: [start:stop:step].

s = "String to reverse."
print s[::-1]

If start is omitted it defaults to 0 and if stop is omitted it defaults to the length of the string. A step of -1 tells Python to start counting by 1 from the stop until it reaches the start.

When working with large strings, or when you just don’t want to reverse the whole string at once, you can use the reversed() built-in. reversed() returns an iterator and is arguably the most Pythonic way to reverse a string.

 

s = "String to reverse."
print ("".join(reversed(s)))

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