Step $1$: Producing correct

output

Three commented$-$out lines of code exist in the main part of the program. Uncomment the lines and click the "Run program" button.

Verify that the program's output is:

$2+2=4$

Unknown method: print$\_$plus$\_2$

Secret string: "abc"

Submit your code for grading. Your submission will pass the "Compare output" test only, achieving $1$ of the possible $10$ points.

Step $2$: Inspecting the LabPrinter class

Inspect the LabPrinter class implemented in the

LabPrinter.py file. Access

LabPrinter.py by clicking on the orange arrow next to

IntroToDSELabs.py at the top of the coding window. Instance methods print$\_2\_$plus$\_2()$ and print$\_$secret $()$ print strings

using print $().$

Step $3$: Implementing call$\_$method$\_$named$()$

Remove the three uncommented lines from the main part of the program. Then implement the call$\_$method$\_$named $()$ function in

IntroToDSELabs.py to handle three cases:

If method$\_$name is "print$\_2\_$plus$\_2",$ call printer's print$\_2\_$plus$\_2()$ instance method.

If method$\_$name is "print$\_$secret", call printer's print$\_$secret $()$ instance method.

If method$\_$name is anything other than the two strings mentioned above, print "Unknown method: xyz$",$ where $xyz$ is

method$\_$name's value.

After implementing call$\_$method$\_$named $(),$ click the "Run program" button. Verify that the program's output is$,$ once again: