notes05a - bc2chow CS 234 Lecture 5 May 21 2013 List in...

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bc2chow’ CS 234: Lecture 5 May’21,’2013 List in Python 1-d’array’ ’ Contiguous’block’of’memory’ Size’fixed’when’created’ Subarray’ –’items’are’stored’in’a’contiguous’subset’of’the’array’ List Operators Creating’lists ’ ’ L=[4,’5,’1,’1,’ -3]’ Access’elements’in’lists’ L[0]’ ’4 ’ L[3]’ ’1 ’ Slicing’[:] ’ L[:2]’ ’[4,’5] ’ L[3:]’ ’[1,’ -3]’ L[:]’ ’[4,’5,’7,’1,’ -3]’ Examples: L’ ’[4,’5,’7,’“c”,’ -3]’ ’ Input Results Note L1=L’ L’ ’[4,’5,’7,’“c”,’ -3]’ ’L1’ ’ L1=L[:]’ L’ ’[4,’5,’7,’“c”,’ -3]’ ’ L1’ ’[4,’5,’7,’“c”,’ -3]’ ’ L3=L[:2]’ L3’ ’[4,’5] ’ L[3]’ ’ ’“c”’ ’ L1[3]’ ’“c” ’ len(L)’ ’ ’5 ’ L.append(47)’ ’
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