Assignment 3.3
Write a program to prompt for a score between 0.0 and 1.0. If the score is out of range, print an error. If the score is between 0.0 and 1.0, print a grade using the following table:
写一个程序来提示0.0和1.0之间的分数。如果分数超出范围，打印一个错误。如果分数在0.0和1.0之间，使用下表打印一个等级。
Score Grade:
'>= 0.9 A'
'>= 0.8 B'
'>= 0.7 C'
'>= 0.6 D'
'< 0.6 F'
If the user enters a value out of range, print a suitable error message and exit.
如果用户输入的数值超出范围，则打印一个合适的错误信息并退出。
input_score = input("Enter Score: ")
try:
score=float(input_score)//score可能重复时，可以score、input_score
if 0<=score<=1.0://区间的方法
if score>=0.9:
print("A")//python 里 print 何时用“” 何时什么都不加？？输出字符串时加"" 需要赋值运算时不加
elif score>=0.8:
print("B")
elif score>=0.7:
print("C")
elif score>=0.6:
print("D")
elif score<0.6:
print("F")
else:
print("Please enter a number between[0,1]")
except:
print("Please enter a number")