Tuesday 20-Sep

Post date: Sep 20, 2011 6:36:46 PM

Announcements

• • New Programming project posted (2 sets of CodingBat problems plus 2 programs)

Homework

• • Take D2L Quiz for Chapter 5, Part 2 (due 10:00pm Thursday) as your are reading pages 131 through 151

    • Sectons 5.4, 5.5, 5.6, 5.8, and 5.8

  • Begin Project 3

Lecture Outline

• • Chapter 5: Sequences, Lists, Strings, and Files

    • Characters are stored like integers

      • 'A' == chr(65)

      • 'a' == chr(97)

      • ord('a') == 97

      • 'a' != 97 # legal but 'a' is not equal to 97

    • Iterate of the sequence of characters in a string with a for loop

s = 'U_of_A!'

for ch in s

print(ch)

• split() breaks up a string into a list of substrings where whitespace separates substrings

s = 'Univ of Ariz !'

list = s.split() # Creates the list ['Univ', 'of', 'Ariz', '!']

• String methods (these are methods, not functions, hence it is 'string'.upper())

s = 'abc'

s.capitalize() s.center(5) s.lower()

s.rjust(6) s.rfind('b') s.replace('a', 'T')

• Methods that appear to change the string, do not

• Code demo: Encryption, Decryption using a for loop

• Consider Project 3

  • Do one CodingBat in List-1