Negative list index

Question

Possible Duplicate    Explain slice notation       I m trying to understand the following piece of code     node list n      for i in xrange 1  numnodes   1       tmp   session newobject        n append tmp  link n 0   n -1     Specifically  I don t understand what the index -1 refers to  If the index 0 refers to the first element  then what does -1 refer to

User · Accepted Answer

Negative numbers mean that you count from the right instead of the left  So  list -1  refers to the last element  list -2  is the second-last  and so on

User · Answer

List indexes of -x mean the xth item from the end of the list  so n -1  means the last item in the list n  Any good Python tutorial should have told you this   It s an unusual convention that only a few other languages besides Python have adopted  but it is extraordinarily useful  in any other language you ll spend a lot of time writing n n length-1  to access the last item of a list

[python] Negative list index?

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