On Wed, May 07, 2014 at 08:49:11PM -0700, Scott W Dunning wrote: [...] > > >>> greeting [len(greeting)] > > > > It is trying to access the character at the position "11", where the > > string "Hello world" doesn't contain any value in the index "11" and > > the maximum index is 10. So it throws the following error. > > I think this is where I am getting confused. I guess I don’t > understand why/how it’s trying to access the character at the index > 11?
The value of greeting is "Hello world". So let's write it out, showing the index of each character. Remember that Python starts counting from zero, not one: Index 0: H Index 1: e Index 2: l Index 3: l Index 4: o Index 5: space Index 6: w Index 7: o Index 8: r Index 9: l Index 10: d So the indexes start from 0, and go up to 10. How many characters are there? Count them, and you get 11. Which makes sense: one character per index, there are at least ten indexes (1 through 10), plus one extra (index 0) makes 11. So the length of the string is 11, but the highest index is 10. So greeting[0] gives "H", greeting[1] gives "e", greeting[2] gives "l", and so on, until you get to greeting[10] which gives "d", and greeting[len(greeting)] => greeting[11] which is an error. -- Steven _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
