grade.py

## Using the 'and' statement
score = int(input("Score: "))

# if score >= 90 and score <= 100:
#     print("Grade: A")
# elif score >= 80 and score < 90:
#     print("Grade: B")
# elif score >= 70 and score < 80:
#     print("Grade: C")
# elif score >= 60 and score < 70:
#     print("Grade: D")
# else:
#     print("Grade: F")    


# ## Better approach for the above:
# if 90 <= score <= 100:
#     print("Grade: A")
# elif 80 <= score < 90:
#     print("Grade: B")
# elif 70 <= score < 80:
#     print("Grade: C")
# elif 60 <= score < 70:
#     print("Grade: D")
# else:
#     print("Grade: F")  


## Even simpler approach:
if score >= 90:
    print("Grade: A")
elif score >= 80:
    print("Grade: B")
elif score >= 70:
    print("Grade: C")
elif score >= 60:
    print("Grade: D")
else:
    print("Grade: F")