Homework: GPA Calculator

作业: GPA 计算器

≈ 40 min · python-decomposition python-functions · Open in WolfCode

Six functions — five helpers + one orchestrator. The shape of every analytics function you'll write at a job.

The six functions

grade_to_points(letter) — float lookup A=4.0 … F=0.0
course_quality_points(grade, c) — points × credits
total_quality_points(courses)
total_credits(courses)
gpa(courses) — guards 0.0 on empty
gpa_report(name, courses) — assembles dict

Python · runnable

def grade_to_points(letter):
    table = {"A": 4.0, "B": 3.0, "C": 2.0, "D": 1.0, "F": 0.0}
    if letter not in table:
        raise ValueError(f"Unknown grade: {letter!r}")
    return table[letter]

def course_quality_points(grade, credits):
    return grade_to_points(grade) * credits

def total_quality_points(courses):
    total = 0.0
    for grade, credits in courses:
        total += course_quality_points(grade, credits)
    return total

def total_credits(courses):
    total = 0
    for _, credits in courses:
        total += credits
    return total

def gpa(courses):
    credits = total_credits(courses)
    if credits == 0:
        return 0.0
    return total_quality_points(courses) / credits

def gpa_report(name, courses):
    return {
        "name":    name,
        "courses": len(courses),
        "credits": total_credits(courses),
        "gpa":     round(gpa(courses), 2),
    }

print(gpa_report("Ada Lovelace", [("A", 3), ("B", 3), ("A", 4), ("B", 3)]))
print(gpa_report("Edge Case", []))

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