Anne
Dawson: CSCI120A_LAB8_SP05.htm
Last
updated: Wednesday 9th March 2005, 2:48 PT
This
document is subject to change without notice.
Please
report any errors or omissions in this document:
adawson@coquitlamcollege.com
Special instructions:
For this assignment you may work in teams of 2, or alone. This lab is due at the end of the lab
session.
CSCI120A
Introduction to Computer Science and
Programming
Spring 2005
Lab Assignment 8
File Handling
Step 1
Study the following program
specification:
You are to write a program which numbers
the lines found in a text file. Write a program that reads text from a file and
outputs each line to the screen and also to another file preceded by a line
number. Print the line number at
the start of the line and right justified in a field width of four spaces. Follow the line number with a colon,
then one space, then the line of text.
Ignore leading spaces on each line. You may assume that the lines are short enough to fit on a
single line on the screen (i.e. normally 80 characters or less).
Note: you do not type in the code
of your program until Step 4.
Your program asks the user for
the name of the file to be read, and the name of the output file to be
generated.
Example 1:
test1.txt
Anne was here on Wednesday 9th
March
at 7:53am
working on the computer
when she should be walking the dog.
The dog is not very happy right
now.
But tomorrow is another day…
result1.txt
1: Anne was here on Wednesday 9th March
2: at 7:53am
3: working on the computer
4: when she should be walking the dog.
5: The dog is not very happy right now.
6: But tomorrow
is another day…
Example 2:
test2.txt
Anne was here on Wednesday 9th
March
at 8:53am
working on the computer
when she should be walking the dog.
The dog is not very happy right
now.
But tomorrow is another day…
Don't forget that quiz 2 is next
week
and you should keep an eye on the schedule
for any updates on the format of quiz 2
It is based on the topics of
weeks 8, 9 and 10
but I may change the format of the quiz.
Good luck and enjoy the weekend!
result2.txt
1: Anne was here on Wednesday 9th March
2: at 8:53am
3: working on the computer
4: when she should be walking the dog.
5: The dog is not very happy right now.
6: But tomorrow is another day…
7: Don't forget that quiz 2 is next week
8: and you should keep an eye on the schedule
9: for any updates on the format of quiz 2
10: It is based on the topics of
weeks 8, 9 and 10
11: but I may change the format
of the quiz.
12: Good luck and enjoy the
weekend!
Step 2
Design an algorithm (the steps to
solve the problem). You should have the algorithm approved by your instructor
before going on to the next step.
The following web page will help
you design your algorithm and pseudocode:
http://www.coquitlamcollege.com/adawson/Pseudocode.htm
Step 3
Development the pseudocode from
your algorithm.
The following web page will help
you design your algorithm and pseudocode:
http://www.coquitlamcollege.com/adawson/Pseudocode.htm
Step 4
Using your pseudocode as a guide,
implement your program in the Python language. Use the IDLE GUI to edit and run
your program:
http://www.coquitlamcollege.com/adawson/Python_Editor_IDLE.htm
Your program should start with a
comment block that contains the following information:
# File: lab8.py
# Purpose: File handling
# Programmer: [your name]
# Partner: [your partner's name]
# Course: CSCI120A
# Date: Wednesday 9th March 2005
# Test data:
Step 5
Test your program by running supplying your own test data. You should
test your program with at least 3 sets of test data. Show your test data and
results in comments at the top of your program.
Step 6
At the end of the class, save your program file (lab8.py) and any test
text files to your folder on the network in:
CSCI120A\Week10\Lab8
Program points will be based on the
following marking scheme:
Marking Scheme: CSCI120A - Lab 8
- File Handling
Student name(s):
|
Category |
Points |
Description |
|
Algorithm |
15 |
An informal description of the
steps that must be taken to solve the problem. |
|
Pseudocode |
15 |
A formal description of the
steps that must be taken to solve the problem. |
|
Comments |
10 |
The program is commented appropriately. |
|
Style |
15 |
The source code should use meaningful variable
names (identifiers). |
|
Output |
15 |
Screen prompts and results should be
user-friendly. |
|
Correctness |
10 |
The program should output correct results. |
|
Completeness |
10 |
The program should be complete. |
|
Test |
10 |
Comments in the code explain how the code was
tested. |