Homework #5

Due: February 27, 2012

Points: 100

As for all earlier assignments, please put refinements for all your programs into one file called “refinements.txt” or “refinements.pdf”, and error journal entries for all your programs into one file called “errors.txt” or “errors.pdf”.

In the example outputs, what your program outputs is in typewriter font, what the user types is in italicized typewriter font, and the user typing “enter” or “return” is represented by the character “↵”. You don’t need to change the font, use italics, or show the “↵” in your output.

1. (50 points) This program asks you to modify the linsearch.py program we discussed in class to read words from a file. Please take that program and add the following command to it. When the user types f file, the contents of file is appended to the list. The file will contain one word per line.

   For example, if the file “xxx.txt” contains the words

   we
   people
   these
   united
   states
   

   an example execution of the program would be:

   what do I do (s word, a word, f file, p)? f xxx.txt↵
   Added word 'we' to list
   Added word 'people' to list
   Added word 'these' to list
   Added word 'united' to list
   Added word 'states' to list
   added words to wordlist
   what do I do (s word, a word, f file, p)? p↵
    1. when
    2. in
    3. the
    4. course
    5. of
    6. human
    7. events
    8. we
    9. people
   10. these
   11. united
   12. states
   what do I do (s word, a word, f file, p)? s states↵
   'states' is word number 12
   what do I do (s word, a word, f file, p)? ↵
   

   Submit: Please turn in your program in the file “ls1.py”.

2. (50 points) Write a program that asks the user for a URL, reads from that URL, and prints the contents. When it prints each line, it also prepends the line number, with the largest line number left-justified and all other line numbers with units’ digit lined up with that of the largest line number, then outputs a tab, and then prints the line. Here is sample input and output (as there are 115 lines in the output, it is truncated):

   What URL should I fetch? http://www.rfc-editor.org/rfc/rfc1149.txt↵
     1.
     2.
     3.
     4.
     5.
     6.
     7. Network Working Group                                        D. Waitzman
     8. Request for Comments: 1149                                       BBN STC
     9.                                                             1 April 1990
    10.
    11.
    12.    A Standard for the Transmission of IP Datagrams on Avian Carriers
    13.
   . . . skipping lines 14 through 112 . . .
   113.
   114. Waitzman                                                        [Page 2]
   115.
   

   Submit: Please turn in your program in the file “urlread.py”.

ECS 10, Basic Concepts of Computing Winter Quarter 2012