Thu Sep 20

Finish the material in chapter 5 in the text, on strings, lists, and files.

Review from Tuesday

• indeces : 'abcde'[2] , 'abcdefghi'[3:7]
• string and list methods : dir([]), dir("") ... and their documentation
• "modification in place" vs "return new value"
• loops over strings or lists
• accumulator coding pattern : building up a new string or list piece by piece

Remaining topics

• converting a string to a list
  • list("one two three")
  • "one two three".split()
• converting a list to a string :
  • str(['a', 'b', 'c])
  • ''.join(['a', 'b', 'c'])
• string formatting
• file input/output

Work through an example or two in class.

A certain CS professor gives 5-point quizzes that are graded on the scale 
5-A, 4-B, 3-C, 2-D, 1-F, 0-F. Write a program that accepts a quiz score 
as an input and prints out the corresponding grade.

rewrite the chaos program from chapter 1 in several ways :
  (a) print the numbers in a nicely aligned table
  (b) output the numbers to a file
  (c) read the inputs from a file

Translate a lowercase word into its cipher, with each letter incremented by 1.

Aside: unix command line input/output redirection as an alternative way to do file input output

$ python yourprogram.py < input.txt > output.txt