回答編集履歴

+ 【追記】コードを試したところ下記エラーが出ました。

+

+ ```

+ Traceback (most recent call last):

+ File "C:\Users\test.py", line 7, in <module>

+ grade = int(input('Please enter the grade: '))

+ ValueError: invalid literal for int() with base 10: '50.5'

+ ```

+

+ 元のコードを活かすとこんな感じでしょうか？

+ ```Python

+ student_number = int(input('How many great to be enter: '))

+ while student_number < 1:

+ print('Invalid. Must be greater than 1. Try again.')

+ student_number = int(input('How many great to be enter: '))

+

+ while student_number > 0:

+ grade = float(input('Please enter the grade: '))

+ student_number -= 1

+ ```

+

+ ---