科目の点数に応じて評価を返すやつ

# 0〜59点はF
# 60〜69点はC
# 70〜79点はB
# 80〜89点はA
# 90〜100点はS

grade = {}
count = 0
subjects_quantity = input('登録する科目の数を入力してください>>')
subjects_quantity = int (subjects_quantity)
while count < subjects_quantity :
      count = count + 1
      subjects_name = input('{}番目の科目名を入力してください>>'.format(count))
      subjects_score = input('{}番目の科目の点数を入力してください>>'.format(count)) 
      subjects_score = int (subjects_score)
      if subjects_score < 0 or subjects_score >100:
            print("不適切な点数") 
      elif subjects_score < 60 :
            print("F")
      elif subjects_score >= 60 and subjects_score <70 :
            print("C")
      elif subjects_score >= 70 and subjects_score <80 :
            print("B")
      elif subjects_score >= 80 and subjects_score <90 :
            print("A")
      elif subjects_score >= 90 and subjects_score <=100 :
            print("S") 
      else :
            pass
grade[subjects_name] = subjects_score
print (grade)