exercise3_3.py

"""
Exercise 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 message. If the score is between 0.0 and
1.0, print a grade using the following table:
Score	Grade
>= 0.9	  A
>= 0.8	  B
>= 0.7	  C
>= 0.6	  D
< 0.6	  F
~~~

Enter score: perfect
Bad score

Enter score: 10.0
Bad score

Enter score: 0.75
C

Enter score: 0.5
F

Run the program repeatedly as shown above to test the various, different
values for input.

Python for Everybody: Exploring Data Using Python 3
by Charles R. Severance

Solution by Jamison Lahman, May 28, 2017
"""

input1 = input('Enter score: ')
try:
	score = float(input1)				#Only allows input floats
except:
	print('Bad score')
	quit()

if score > 0 and score < 1:				#Scores must be between 0.0 and 1.0
	if score >= .9:
		print('A')
	elif score >= .8:
		print('B')
	elif score >= .7:
		print('C')
	elif score >= .6:
		print('D')
	else:
		print('F')
else:
	print('Bad score')