Assignment 1

Question #1

Write and document a Python script fileop.py which takes as command-line arguments a file of integers and a string op and does the following:
• Print "x / y", where x is the number of integers in the file and y is the number of non-integers in the file (op == "val").
• Print "x", where x is the smallest integer in the file (op == "min").
• Print "x", where x is the largest integer in the file (op == "max").
• Print "x", where x is the sum of all integers in the file (op == "sum").
• Print "x", where x is the average of all integers in the file, i.e., sum / float(# integers in file) (op == "avg").

This script must produce the appropriate error message (see typescript-file below) when either the file cannot be read or op is not a valid operation. Your script must work on datafiles fileop1.dat, fileop2.dat, and fileop3.dat to produce the output given in typescript-file fileop.script.

Question #2

Write and document a Python script tagfilt.py which takes as command-line arguments an input file, an output file, and a set of one one-word tag-strings and writes all lines in the input file that start with one of those tag-strings to the output file. This script must produce the appropriate error message (see typescript-file below) when either the input file cannot be read or the output file cannot be written. Your script must work on datafile tagfilt.dat to produce the output given in typescript-file tagfilt.script.

Hints

You may find the various example scripts in the course notes of use.

Submission

Please hand in printed copies of all of your Python script files. You must also submit these files electronically using the submit-assignment command. At the top of each printout, please write your name and student number. You do not have to develop your code on our CS departmental systems. However, as your code will be compiled and tested on our CS departmental systems as part of the assignment marking process, you should ensure that your code compiles and runs correctly on at least one of these systems.

Additional Notes:

• Jan 11, 5:25pm
  Assignment #1 posted.

Created: January 11, 2008
Last Modified: January 11, 2008