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I was googling for a way to reverse a string and I found this.

>>> 'asd'[::-1]
>>> 'dsa'

It works, but there was no explanation where I got if from. Can someone please be kind enough to explain it. Thanks.

You have to read up on the slicing operator in the Python Manual.

Generally you can slice a sequence with [start: end: step]
By default start=0, end=len(seq), step=1
step=-1 goes from the end to the beginning of the sequence, hence your reverse.

For some nice slicing examples see post #4 at;
http://www.daniweb.com/forums/post104865.html#post104865

Comments
very clarifying post. link to good examples.

You have to read up on the slicing operator in the Python Manual.

Generally you can slice a sequence with [start: end: step]
By default start=0, end=len(seq), step=1
step=-1 goes from the end to the beginning of the sequence, hence your reverse.

For some nice slicing examples see post #4 at;
http://www.daniweb.com/forums/post104865.html#post104865

I have used slice notation in the past. I wasn't aware that there was the 'step'. Thanks for your reply and link to the post.

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