Lab $4,$ CSC $101$

This lab provides additional exercises on conditional reasoning and an introduction to loops.

Conditionals modify these files. The driver provides a mostly complete program but it needs a function to work properly. This is the function that you are to write. The pattern files provide text$-$based "images". called multiple times; once for each position in the pattern image.

As an example, pattern $00$ is made up entirely of repeated $\text{'}A\text{'}$ characters. As such, the letter function could be written as follows.

def letter$(row,$ col$)$:

return $\text{'}A\text{'}$

row $=0$ and col $=0.$ So if the pattern consisted of all $\text{'}$A$\text{'}$ characters but with a single $\text{'}G\text{'}$ character in the top$-$left corner, then the letter function might look as follows.

def letter$($row$,$ col$)$:

if $($row $=0$ and col$=0)$:

return $\text{'}G\text{'}$

else:

return $\text{'}A\text{'}$

Multiple Files and All That

name of the pattern$).$ must pass your letter function $($by specifying the name as you would a variable$).$ The following code completes the "all A$"$ pattern example discussed above.

import driver

def letter$($row$,$ col$)$:

return $\text{'}A\text{'}$

Patterns $-$ What you need to do$.$

In pattern$0.$ py$,$ write the letter function that will generate the pattern image in pattern$00.$

When you run this program, you must tell the program which pattern to compare against. You can do so as follows.

python$3$

pattern$00.$py $$ pattern$00$

In

pattern$01.$py$,$ write the letter function that will generate the pattern image in pattern$01.$

In pattern$02.$ py$,$ write the letter function that will generate the pattern image in pattern$02.$

In pattern$03.$ py$,$ write the letter function that will generate the pattern image in pattern$03.$

In pattern$4.$ py$,$ write the letter function that will generate the pattern image in pattern$4.$

In

pattern$05.$py$,$ write the letter function that will generate the pattern image in pattern$05.$

pattern$06$

In

pattern$06.$py$,$ write the letter function that will generate the pattern image in pattern$6.$

In pattern$07.$ py$,$ write the letter function that will generate the pattern image in pattern$07.$

Where do I start? pattern$01$ and try to make pattern$01.$ py$!$ Note that your functions will not print anything. There will be no loops in your functions.

Loops

This part of the lab introduces you to loops in Python. You are asked to edit a small program that uses various loops to accomplish a task.

Code Reading

In the repository you downloaded from GitHub, you will find a file called cubesTable. py$.$ Study the source code to see how it works.

Predict the output from the program if the user enters: $930$

Run the code to see if your prediction is correct.

Then predict the output from the program if the user enters: $-5530$

Run the code to see if your prediction is correct.

Finally predict the output from the program if the user enters: $5,5,-9,3$

Run the code to see if your prediction is correct.

Enhancement #$1$

Enter the value of the first number in the table: $-3$

First number must be non$-$negative.

Enter the value of the first number in the table: $2$

Enhancement #$2$

Complete the show$\_$table$()$ function by implementing the code for a for loop that will display the desired table of cubes. For example, if the user enters $45$ as the inputs, the table will look like this:

$\backslash$table$[[$Number$,$Cube$],[5,125],[6,216],[7,343],[8,512]]$

Enhancement #$3$ the message "Increment must be non$-$negative.".

Modify the show$\_$table$()$ function so that it takes a third parameter that is the row increment in the table. Modify the counting loop so that it uses the row increment when displaying the table.

Modify the main $()$ function so that it calls get$\_$increment$()$ and passes the result to show$\_$table$().$ For inputs of $453$ the table should now look like this:

$\backslash$table$[[$Number$,$Cube$],[5,125],[8,512],[11,1331],[14,2744]]$

Hint: To get the numbers to line up nicely $($as shown above$),$ I print the first number left justified in a column of six spaces. You can do that using the $\%-6d$ modifier, like this:

print$("$

first,

Enhancement #$4-$ Last one!

Enhance the show$\_$table$()$ function so that it displays the sum of all the cubes in the table on a separate line below the table, in the format "The sum of cubes is: $x"($where $x$ is the sum of cubes$).$