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I am on PS4 I dont understand why if (i + shift) < len(uppercase): coder[uppercase[i]] = uppercase[i + shift] returns key value pair in dict when i is 0 and shift is - 2 (as happens in prob set sol with decoder) as there is no index -2 in uppercase string interestingly ' ' as key gives 'x' why is this so

MIT 6.00 Intro Computer Science (OCW)
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the shell (or idle) is a great place to play and experiment http://dpaste.com/787903/ from the Tutorial in the Python documentation: an intro to slices in this strings section http://docs.python.org/tutorial/introduction.html#strings and see note 3 from: http://docs.python.org/library/stdtypes.html#sequence-types-str-unicode-list-tuple-bytearray-buffer-xrange The Python documentation should be installed on your computer - the Tutorial is a must-read. http://stackoverflow.com/questions/509211/good-primer-for-python-slice-notation http://effbot.org/zone/python-list.htm
Thanks bwCA Sorted

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