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It selects all but the last element of a sequence.
[-1] means the last element in a sequence, which in this is case is the list of tuples like (element, count) , order by count descending so the last element is the least common element in the original collection.
What does [:-1] in Python actually do and why would you want to use it? [:-1] in Python is a slice operation used on strings or lists and captures all contents of the string or list except for the last character or element.
Possible Duplicate:
The Python Slice Notation
I'm trying to port some Python code to C, but I came across this line and I can't figure out what it means:
if message.startswith('<stream:stream'): message = message[:-1] + ' />' I understand that if 'message starts with <stream:stream then something needs to be appended. However I can't seem to figure out where it should be appended. I have absolutely no idea what :-1 indicates. I did several Google searches with no result.
Would somebody be so kind as to explain what this does?
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