Sample Solution

The following shows one way to solve this problem. It is not the only way this can be solved.

teach05_stretch_sample.py

"""
File: teach05_stretch_sample.py
Author: Brother Burton

Purpose: Determine and display letter grades, including +/-.
"""

grade = int(input("What is your grade percent? "))

if grade >= 90:
    letter = "A"
elif grade >= 80:
    letter = "B"
elif grade >= 70:
    letter = "C"
elif grade >= 60:
    letter = "D"
else:
    letter = "F"

# Stretch Challenge 1
sign = ""

last_digit = grade % 10

if last_digit >= 7:
    sign = "+"
elif last_digit < 3:
    sign = "-"
else:
    sign = ""

# Stretch Challenge 2
if grade >= 93:
    sign = ""

# Stretch Challenge 3
if letter == "F":
    sign = ""

print(f"Your letter grade is: {letter}{sign}")

if grade >= 70:
    print("Congratulations! You passed the class!")
else:
    print("Stay focused and you'll get it next time!")