为什么For循环只迭代一次？

Question

我需要在 StudentInfo.tsv 中获取此信息：

Barrett    Edan    70  45  59

Bradshaw    Reagan  96  97  88
Charlton    Caius   73  94  80
Mayo    Tyrese  88  61  36
Stern    Brenda  90  86  45

并使其输出到另一个文件，如下所示：

Barrett    Edan    70  45  59  F
Bradshaw    Reagan  96  97  88  A
Charlton    Caius   73  94  80  B
Mayo    Tyrese  88  61  36  D
Stern    Brenda  90  86  45  C

Averages: midterm1 83.40, midterm2 76.60, final 61.60

这就是我重写学生信息并添加字母成绩的情况。然而，for 循环并没有按照我需要的方式运行。

我得到的输出是'[]'

import csv

def calculate_grade(average_score):
  if average_score >= 90:
      return 'A'
  elif 80 <= average_score < 90:
      return 'B'
  elif 70 <= average_score < 80:
      return 'C'
  elif 60 <= average_score < 70:
      return 'D'
  else:
      return 'F'

tsv_input = str(input())
student_data = []


with open(tsv_input) as file_a:
    tsv_read = file_a.readlines()
    
    for row in tsv_read:
        student_data = [row.strip().split('\t')]

with open('report.txt', 'a+') as final_file:
    for info in student_data:
        last_name, first_name, midterm1, midterm2, final = info
        average_score = (float(midterm1) + float(midterm2) + float(final)) / 3
        
        final_grade = calculate_grade(average_score)
        
        final_file.write(f'{last_name}\t{first_name}\t{midterm1}\t{midterm2}\t{final}\{final_grade}\n')
    final_read = final_file.readlines()
    print(final_read)

Answer 1

更改线路：

student_data = [row.strip().split('\t')]

至：

student_data.append(row.strip().split("\t"))

您不想将

student_data

分配给新的内容，而是向其附加分割线。