Lec10ListsDicts

Lec10ListsDicts - Lecture 9 Lists In Class Today: 1) Three...

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Lecture 9 – Lists – In Class Today: 1) Three solutions to Friday’s encryption lab 2) Memory, what it looks like, how lists are different 3) Bunch of examples using lists def encrypt(string): cipherText = “” for ch in string: letter =encryptLetter(ch) cipherText = cipherText + letter return cipherText # solution #1 def encryptLetter(letter): number = (ord(letter)-ord(‘a’) + 13)% 26 return chr(number + ord(‘a’)) # solution #2 def encryptLetter(letter): number = ord(letter) if (letter < ‘n’): newNumber = number+13 else: newNumber = number-13 return chr(newNumber) # solution #3 def encryptLetter(letter): key = “nopqrstuvwxyzabcdefghijklm” number = ord(letter) – ord(‘a’) return key[number] What does memory look like? Remember how to draw memory like on the board a=b -> a and b are pointing to the SAME memory a = b*2 -> makes a new list for a a = b+c -> also makes a new list for a a[0] 4 a[x] a[1] 7 a[0] + x 4 + 1 5 a[x] + 0 a[1]+0 -> 7 + 0 -> 7 Relationship between lists and loops
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This note was uploaded on 12/27/2011 for the course CMPSC 8 taught by Professor Franklin during the Fall '09 term at UCSB.

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Lec10ListsDicts - Lecture 9 Lists In Class Today: 1) Three...

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