I keep getting errors and I'm lost!

[samjonsnell]

Wow! Thank you guys for your help! Unfortunately, I am running into another problem. When I type in letters other than "Quit" it is suppose to say "Bad Score" but I am getting this error:

Traceback (most recent call last):
File "/tmp/sessions/375e0408eaad1508/main.py", line 23, in <module>
if float(score) > 1.0:
ValueError: could not convert string to float: 'perfect'

I thought the try and except was suppose to take care of that...

Here is my new code so far:

# if letters are entered instead of numbers, 
#program will send "Bad Score" to user and 
# ask user to "Enter score or type 'Quit' to exit".
try:
  score = input("Enter score or type 'Quit' to exit: ")
except:
  print("Bad score.")


def computegrade(score):
    return grade
while True:
# if "Quit" is entered by user, 
# "Thanks for using the grade calculation program!" will print and 
# end the program.  
  if score == "Quit":
      print("Thanks for using the grade calculation program!")
      quit()
# if a number is entered that is larger than 1.0, program will 
# send "Bad Score" to user and ask the user "Enter score or type 
# 'Quit' to end program".
  if float(score) > 1.0:
      print("Bad score.")
      score = input("Enter score or type 'Quit' to exit: ")
      
# if number entered is equal to 1.0 or in between 1.0 and 0.9 it 
# will print "A"
  elif float(score) == 1.0 or float(score) >= 0.9:
      grade = ("A")
      print("A")
      score = input("Enter score or type 'Quit' to exit: ")

# if number entered is equal to 0.89 or in between 0.89 and 0.8 it 
# will print "B"
  elif float(score) == 0.89 or float(score) >= 0.8:
      grade = ("B")
      print("B")
      score = input("Enter score or type 'Quit' to exit: ")

# if number entered is equal to 0.79 or in between 0.79 and 0.7 it 
# will print "C"
  elif float(score) == 0.79 or float(score) >= 0.7 :
      grade = ("C")
      print("C")
      score = input("Enter score or type 'Quit' to exit: ")
  
# if number entered is equal to 0.69 or in between 0.69 and 0.6 it
# will print "D"
  elif float(score) == 0.69 or float(score) >= 0.6:
      grade = ("D")
      print("D")
      score = input("Enter score or type 'Quit' to exit: ")

# if number entered is less than 0.6 it will print "F"
  elif float(score) < 0.6:
      grade = ("F")
      print("F")
      score = input("Enter score or type 'Quit' to exit: ")
# if "Quit" is entered by user, 
# "Thanks for using the grade calculation program!" will print and 
# end the program.  
  if score == "Quit":
      print("Thanks for using the grade calculation program!")
      quit()
  
print(computegrade(score))