Question

Python

Using tkinter, create a GUI interface which accepts input of a GPA.

If the GPA is >= 3.5, display 'Dean’s List'

If the GPA is < 2.0, display 'Probation’

If the GPA is < 3.5 and >= 2.0, display 'Regular Standing'

Run one test case for each case above and save the output.

Answer 1

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• I used comments for better understanding. Comments starts with ' # '
• Please refer to the screenshot of the code to understand the indentation of the code

Language : Python

:::::::::::::::::::::::::::::::::::::::::::: CODE ::::::::::::::::::::::::::::::::::::::::

from tkinter import *

# Function to set Result Label text
def callback(sv,label):

# try - except block to avoid errors
try:
# if entry value is null, set label text as belo
if(sv.get().strip()==""):
label.set("Enter GPA")
return

# if entry value is not null, conver value to float
gpa = float(sv.get())

# to store result text
result = ""

# assign result text as rules
if(gpa>=3.5):
result = "Dean’s List"
elif(gpa<3.5 and gpa>=2.0):
result = "Probation"
else:
result = "Regular Standing"

# set label text to result value
label.set(result)

except ValueError:
# if any value error occured, set label as Invalid gpa
label.set("Invalid GPA")

# main function
def main():
# create tkinter object
root = Tk()
# set window title, size of width 300 and heigth 200
root.title("GPA")
root.geometry("300x200")

# set window to non resizable
root.resizable(0,0)

# creating StringVar for window. one for entry, one for result label
sv = StringVar()
result = StringVar(root)

# trace StringVar to call callback with both StringVar above
# this trace changes in Entry of GPA value
sv.trace("w", lambda name, index, mode, sv=sv: callback(sv,result))

# create label at x-axis 10 and y-axis 20
Label(root,text="Enter GPA : ",font=(12)).place(x=10,y=20)

# create entry box at x-axis 100 and y-axis 20 and set textvariable to StringVar "sv"
Entry(root, textvariable=sv,font=(12)).place(x=100,y=20)

# create label for result label, at x-axis 150 and y-axis 100 and set anchor to center
# and set textvariable to StringVar "result"
Label(root,textvariable=result,font=(12)).place(x=150,y=100,anchor="center")

# run window
root.mainloop()

# Call above main method
main()
:::::::::::::::::::::::::::::::::::::::::::: OUTPUT ::::::::::::::::::::::::::::::::::::::::

No GPA Entered/ Only whitespaces

Entered Value for Regular Standing

Entered Value for Probation

Entered Value for Dean's List

Entered Invalid Value/Characters

:::::::::::::::::::::::::::::::::::::: CODE in EDITOR ::::::::::::::::::::::::::::::::::

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