IT 116: Introduction to Scripting

IT 116: Introduction to Scripting
Homework 6

Due
What You Need to Do
Setup On Your Machine
Specification
Functions
Test Code
Output
Suggestions
Testing on Your Machine
Copy the Script to Unix
Testing the Script on Unix (Optional)

Due

Sunday, March 9th at 11:59 PM

What You Need to Do

Create the script hw6.py
Make sure it obeys the rules in Rules for Homework Scripts
Move it to an an hw6 directory on pe15.cs.umb.edu

Setup On Your Machine

Open a text editor.
I would suggest the text editor built into the program IDLE.
Save the file as hw6.py

Specification

This script prints a table of a table of inches and their equivalent centimeter value
Inches can be converted to centimeters using the formula
```
cm = inches * 2.54
```
Centimeter values must be integers
The table will run between a minimum and maximum value entered by the user
The centimeter values must be converted to integers
The script must ask the user for maximum and minimum inches
It should then print a blank line
The labels "Inches" and "Centimeters" should appear at the top of the table
Under these labels should be a line of dashes
Then it prints a table of inches and their centimeter values
The centimeter values should align with the "Centimeters" label
In other words, the output will look the same as hw5.py
But it will produce this output in a different way
The script will create the table using 3 functions which you must write.
- print_table
- print_header
- print_line

Functions

print_table

Header
```
def print_table(min, max):
```
This function will will print the conversion table
It will call print_header to print the labels at the top of the table
It will use a for loop to call print_line which will print each line of the table
It will be called by the test code you will find below

print_header

Header
```
def print_header():
```
This function should print the labels "Inches" and "Centimeters"
It should then print a line of dashes

print_line

Header
```
def print_line(inches):
```
This function will print one line of the conversion table
It will convert the inches value into centimeters
Then it will print the inches and centimeters values
See the output below

Test Code

Your script must contain the following statements

min = int(input("Minimum: "))
max = int(input("Maximum: "))
print()
print_table(min, max)

They should appear at the bottom of your script

Output

The output should look something like this

Minimum: 1
Maximum: 10

Inches	Centimeters
-------------------
1	3
2	5
3	8
4	10
5	13
6	15
7	18
8	20
9	23
10	25

The text in blue is what the user enters

Suggestions

Write this script in stages
Test your script at each step
Print the steps below
And check them off as you finish each one

Copy only the function headers for the three functions listed above into your script file.
Under each header, write pass.
pass is a special Python statement that does nothing.
You use it in situations like this.
Make sure each pass statement is indented.
Run the script.
Fix any errors you find.
Remove the pass statement from print_table.
Print the parameters min and max.
Copy the test code above to the bottom of your script.
Run the script.
Fix any errors you find.
Replace the print statement in print_table with a call to print_header.
Remove the pass statement from print_header.
Add a print statement for the labels at the top of the table.
You will need to put a Tab character between the two words so everything will line up.
You do this with an escape sequence.
Add another print statement for the line of dashes.
Run the script.
After the input prompts you should see
```
Inches	Centimeters
-------------------
```
Fix any errors you find.
In print_table add a for loop using the loop variable inches and the range function.
Range should produce all the values between min and max.
Think carefully when choosing the arguments for range. Inside the loop print the value of inches.
Run the script.
Fix any errors you find.
In print_table replace the print statement inside the for loop with a call to print_line.
Inside print_line remove the pass statement.
Replace it with a statement that prints the value of the parameter inches.
Run the script.
The output should be the same as above but now it comes from print_line.
Fix any errors you find.
Remove the print statement from print_line.
In it's place you need to write an assignment statement that sets the value of the local variable cm.
Use the same formula you used in homework 5 to get the value for cm.
Print the values of both inches and cm.
Run the script.
Fix any errors you find.
Change the print statement in print_line so it prints a single string with a Tab character between inches and cm.
You will have to use the conversion function str to change both variables to a string.
The values should line up with the labels for each column.
Run the script.
Fix any errors you find.

Testing on Your Machine

Open IDLE
Use the Open command in IDLE to open hw6.py
Run your script inside IDLE

Your output should look something like this

Minimum: 1
Maximum: 10

Inches	Centimeters
-------------------
1	3
2	5
3	8
4	10
5	13
6	15
7	18
8	20
9	23
10	25

The text in blue is what you enter at the command line

Copy the Script to Unix

Open FileZilla and connect to pe15.cs.umb.edu
Go to your it116 directory
Go to your hw directory
Right-click in the whitespace inside the hw directory
Enter hw6 in the dialog box
Click and drag your script from the bottom left panel to the bottom right panel

Testing the Script on Unix (Optional)

Connect to pe15.cs.umb.edu using an ssh client like putty.exe (Windows) or ssh (Mac)
Go to the directory for this exercise
```
cd  it116/hw/hw6
```
Run this script
```
python3 hw6.py
```

You should see something like this

Minimum: 1
Maximum: 10

Inches	Centimeters
-------------------
1	3
2	5
3	8
4	10
5	13
6	15
7	18
8	20
9	23
10	25

The text in blue is what you enter at the command line