Lab 14
Reminder
The program Jython Environment for Students (or JES) is the
development environment that we will use for this lab.
In the ACCC Labs that have JES, it can be found by:
- Clicking on Start
- Then click on All Programs
- Then click on Class Applications
- Then click on Engineering
- Finally click on Jython Environment for Students
Writing Text to a File
From JES, we can write text information out to a file.
This will be very useful for the 4th Homework assignment.
We first need to open a file which would use the following command:
open (name, usage)
where: name is the name of the file you want to write to
where: usage will inform JES we want to write to the file
where: it will return a file object that we store in a variable.
This is often used as follows:
filename = pickAFile ()
fileobj = open (filename, "wt")
TO write to the file we need to combine the file object returned by
open( ) with the function write( ) as follows:
fileobj.write("Hello")
The will place the word Hello in the file that was opened.
Note the different way in which the function is used. There is a
dot between the file object and the write( ) function. This format
is used for object oriented method calls. Don't worry to much
about it now, but if you don't follow the format shown above, it
won't work.
One item to note is that the write( ) function/method will always
write on the smae line of a file. Thus the code:
fileobj.write("Hello")
fileobj.write("How are you?")
fileobj.write("I am fine")
would appear in the file as:
HelloHow are you?I am fine
To get the data to write on a new line in the file, we must insert a
"backslash n". Such as:
fileobj.write("Hello\n")
fileobj.write("How are you?\n")
fileobj.write("I am fine\n")
This would appear in the file as:
Hello
How are you?
I am fine
Note to print a regular backslash in your code you must list
two backslashes and to print a double quote you must list
a backslash double quote as follows:
fileobj.write(" \\ \" ")
would appear in the file as:
\ "
Lab Assignment 14
Due: Tuesday 5/1/2007 by 11:59 pm
For this assignment,
your JES file that contains the above function must
Create a file using JES that will:
- Contain a comment indicating
- your Name,
- Net-ID,
- Course Name,
- Assignment Name and
- a short description of
the assignment
- Contain a JES function called lab14 () that will write the
following information out to a file.
- Your Name
- Your Net-ID
- CS 101
- Your Lab Time
Each of these items are to be written on a separate line in the
file. You are to prompt the user for the name of the file with
pickAFile.
These functions may call other functions that are built-in to JES or
that you have written.
Note that this is very similar to Lab 2
except that we are writing
the information to a file not out to the JES command area.
Submittal of the Lab Assignment
- You are submit your program electronically by placing it in the
digital drop box in blackboard.
- Programs that are correct and
submitted by noon on the Wednesday
the lab assignment is discussed will receive an extra 10% on the
score of the lab.
- When saving your program, use a meaningful name like lab14.py.
- When submitting your lab assignment, place all of the needed files it in a
zippped folder (even if you are only submitting one file) with the name
of yournetid_labNum and submit that zipped folder to the digital
drop box. For instance, if your net id is
abc32 then the folder name should be abc32_lab14.
Comments on the ACCC Labs
On the computers in the ACCC Labs there should an H: drive.
This drive is actually a networked connection to your own file space
maintained by the ACCC. No matter what machine you use or what lab
you are in, the H: drive will access the same file space. This means
that you can save a file on the H: drive on a computer in one lab and
access that same file on a computer in another lab. This can be very
helpful. It is suggested that you store your python program files
on your H: drive.