6-2 按等级统计学生成绩pta

为了按等级统计学生成绩，可以采用编程的方式处理成绩数据。下面提供一种可能的Python实现方案来完成这个任务。 创建一个程序以读取学生的名字和分数，并将其保存在一个文本文件`score.txt`中。之后从该文件读取数据计算每位学生的平均分、最高分、最低分等统计数据，并根据预设的成绩区间分配相应的字母等级（例如A, B, C, D, F）。这里是一个简单的例子： ```python def save_scores_to_file(scores_dict, filename='score.txt'): with open(filename, 'w') as file: for name, score in scores_dict.items(): file.write(f"{name},{score}\n") def read_scores_from_file(filename='score.txt'): try: with open(filename, 'r') as file: lines = file.readlines() return {line.split(',')[0]: float(line.split(',')[1]) for line in lines} except FileNotFoundError: print("File not found.") return {} def calculate_statistics(scores): if len(scores) == 0: return None avg_score = sum(scores.values()) / len(scores) max_score = max(scores.values()) min_score = min(scores.values()) # Assuming the grading scale is A >=90 > B >=80 > C >=70 > D >=60 > F def get_grade(score): if score >= 90: return "A" elif score >= 80: return "B" elif score >= 70: return "C" elif score >= 60: return "D" else: return "F" grades = {} for student, score in scores.items(): grade = get_grade(score) if grade not in grades: grades[grade] = [] grades[grade].append(student) return { 'average': avg_score, 'max': {'student': list(filter(lambda x: scores[x]==max_score, scores)), 'score': max_score}, 'min': {'student': list(filter(lambda x: scores[x]==min_score, scores)), 'score': min_score}, 'grades_distribution': grades } # Example usage: scores_data = {"Alice": 88.5, "Bob": 92.3, "Charlie": 74.2} # Sample data to be saved into a file. save_scores_to_file(scores_data) read_data = read_scores_from_file() stats = calculate_statistics(read_data) if stats: print(f"Average Score: {stats['average']}") print(f"Highest Score(s): {', '.join(stats['max']['student'])}, Score: {stats['max']['score']}") print(f"Lowest Score(s): {', '.join(stats['min']['student'])}, Score: {stats['min']['score']}") print("\nGrade Distribution:") for grade, students in sorted(stats['grades_distribution'].items()): print(f"Grade {grade}: {students}") ``` 这段代码实现了如下功能： - `save_scores_to_file`: 将给定的学生姓名及其对应的分数字典写入指定的文本文件。 - `read_scores_from_file`: 从指定的文本文件中读取学生姓名及其对应分数的数据，并返回一个字典形式的结果。 - `calculate_statistics`: 对提供的分数列表执行基本统计运算，包括计算平均值、最大最小值以及根据特定评分标准划分等级分布情况。