Python处理学生成绩数据：计算总评、统计分数段及计算平均分

import re

def process_student_scores(input_file, output_file):
    """
    处理学生成绩数据，计算总评成绩，统计分数段，并计算平均分。

    Args:
        input_file (str): 输入文件路径，包含学生学号、平时成绩和期末成绩，以空格分隔。
        output_file (str): 输出文件路径，保存学生学号和总评成绩。
    """

    student_scores = []
    total_score = 0
    grade_counts = {'90+': 0, '80-89': 0, '70-79': 0, '60-69': 0, '<60': 0}

    try:
        with open(input_file, 'r') as f:
            for line in f:
                # 使用正则表达式分割字符串
                data = re.split(r'\s+', line.strip())
                if len(data) != 3:
                    print(f"Warning: Invalid data format in line: {line.strip()}")
                    continue

                student_id, usual_score, final_score = data
                try:
                    usual_score = int(usual_score)
                    final_score = int(final_score)
                except ValueError:
                    print(f"Warning: Invalid score format in line: {line.strip()}")
                    continue

                overall_score = round(0.4 * usual_score + 0.6 * final_score)
                student_scores.append((student_id, overall_score))
                total_score += overall_score

                # 统计分数段
                if overall_score >= 90:
                    grade_counts['90+'] += 1
                elif 80 <= overall_score <= 89:
                    grade_counts['80-89'] += 1
                elif 70 <= overall_score <= 79:
                    grade_counts['70-79'] += 1
                elif 60 <= overall_score <= 69:
                    grade_counts['60-69'] += 1
                else:
                    grade_counts['<60'] += 1

        # 写入结果到文件
        with open(output_file, 'w') as f:
            for student_id, overall_score in student_scores:
                f.write(f"{student_id} {overall_score}\n")

        # 计算平均分
        num_students = len(student_scores)
        average_score = total_score / num_students if num_students > 0 else 0

        # 输出统计结果
        print(f"Total number of students: {num_students}")
        print("Grade distribution:")
        for grade, count in grade_counts.items():
            print(f"{grade}: {count}")
        print(f"Average score: {average_score:.1f}")

    except FileNotFoundError:
        print(f"Error: Input file '{input_file}' not found.")
    except Exception as e:
        print(f"An error occurred: {e}")

# 示例用法
input_file = "score1.txt"
output_file = "score2.txt"
process_student_scores(input_file, output_file)