Python Build a Student Grade Tracker with Lists

A teacher summarizes scores recorded for a small class.

What You Need to Understand

A grade tracker stores numeric scores in a list, computes a total and average, and determines highest and lowest values. Handle an empty class explicitly before dividing.

When to Use It

A teacher summarizes scores recorded for a small class.

Step-by-Step Python Example

grades = [82, 90, 74, 88]
if grades:
    average = sum(grades) / len(grades)
    print(f"Average: {average:.1f}")
    print("Highest:", max(grades))
    print("Lowest:", min(grades))
else:
    print("No grades recorded")

How the Example Works

The average uses the total divided by the number of students; the guard avoids division by zero.

Example Output

Average: 83.5
Highest: 90
Lowest: 74
75.0

A Second Example

Compare this smaller variation with the main example, then experiment with your own values.

grades = [70, 80]
print(sum(grades) / len(grades))

Important Behavior and Edge Cases

An average alone can hide variation, and values outside the permitted grading range should be validated before entry.

Try It Yourself

Add grades 95 and 100 and check the new average.

Common Beginner Mistakes

An average alone can hide variation, and values outside the permitted grading range should be validated before entry.
Overlooking how an iterable is consumed, how element positions are chosen, or whether a function creates a new list.

Key Takeaways

A grade tracker stores numeric scores in a list, computes a total and average, and determines highest and lowest values.
The average uses the total divided by the number of students; the guard avoids division by zero.
An average alone can hide variation, and values outside the permitted grading range should be validated before entry.