Python成绩册程序读写记录与等级统计异常求助

Let's get your grade tracking program sorted out! I've put together a complete, working Python solution that handles all your requirements—inputting class/teacher/student info, counting grade distributions, and saving everything to a text file. Here's the code, followed by a breakdown of how each part works:

def main():
    # Collect basic class information
    class_name = input("Enter the class name: ")
    teacher_name = input("Enter the teacher's name: ")
    
    # Set up counters for each grade level
    grade_counters = {'A': 0, 'B': 0, 'C': 0, 'D': 0, 'F': 0}
    student_grades = []
    
    # Gather student data with input validation
    print("\nEnter student names and their letter grades (type 'done' when finished):")
    while True:
        student_name = input("Student name: ")
        if student_name.lower() == 'done':
            break
        
        # Ensure we get a valid letter grade
        grade = input(f"Letter grade for {student_name}: ").upper()
        while grade not in grade_counters:
            grade = input(f"Oops, that's not a valid grade! Please enter A/B/C/D/F for {student_name}: ").upper()
        
        student_grades.append((student_name, grade))
        grade_counters[grade] += 1
    
    # Compile all output content
    output_lines = [
        f"Class Name: {class_name}",
        f"Teacher Name: {teacher_name}",
        "\nStudent Grades:",
    ]
    for name, grade in student_grades:
        output_lines.append(f"- {name}: {grade}")
    
    output_lines.append("\nGrade Distribution:")
    for grade, count in grade_counters.items():
        output_lines.append(f"- {grade}: {count} student(s)")
    
    # Combine lines into a single string for easy printing/writing
    full_output = '\n'.join(output_lines)
    
    # Display results to the console
    print("\n" + full_output)
    
    # Save everything to the specified text file
    file_name = f"{class_name}Grades.txt"
    with open(file_name, 'w') as grade_file:
        grade_file.write(full_output)
    print(f"\nAll data has been saved to {file_name}")

if __name__ == "__main__":
    main()

• Input Validation: The program checks that each grade is one of A/B/C/D/F, so you don't have to worry about invalid entries messing up your stats.
• Organized Data Tracking: We use a dictionary to count grades (super efficient for this kind of tallying) and a list to store individual student records.
• Dual Output: The same content is printed to the console and saved to a file, so you get immediate feedback and a permanent record.
• Clean File Handling: The with statement automatically closes the file after writing, which is the safest practice in Python to avoid data loss.

1. Run the script.
2. Enter the class name when prompted (e.g., "Math 101").
3. Enter the teacher's name.
4. For each student, type their name and their letter grade. When you're done adding students, type done as the student name.
5. The program will show you the full grade breakdown, and save all the info to a file named like Math101Grades.txt in the same folder as the script.

内容的提问来源于stack exchange，提问作者Belewsmom