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Bruno Correia
3,114 PointsGetting error if input is not valid
Hi community!
I have followed the video and out of curiosity tried all the possibilities once the script was complete. It turns out I'm getting an "UnboudLocalError" if my initial input is not valid (if it's a letter, for example).
Now I know we have written the try and except to avoid exactly that but I'm almost sure my code looks exactly like what is shown in the video and it still doesn't work. Could it be that Kenneth's code will throw the same exceptions as well or is it something with my code?
The console shows:
"Traceback (most recent call last):
File "number_game.py", line 36, in <module>
game()
File "number_game.py", line 17, in game
print("{} isn't a number!".format(guess))
UnboundLocalError: local variable 'guess' referenced bef
ore assignment "
My code looks like this:
import random
def game():
# generate random number between 1 and 10
secret_num = random.randint(1, 10)
guesses = []
while len(guesses) < 5:
try:
# get a number guess from the player
guess = int(input("Guess a number between 1 and 10: "))
except ValueError:
print("{} isn't a number!".format(guess))
else:
# compare to secret number
if guess == secret_num:
print("You got it! My number was {}".format(secret_num))
break
elif guess < secret_num:
print("Higher!")
else:
print("Lower!")
guesses.append(guess)
else:
print("You didn't get it! My number was {}.".format(secret_num))
play_again = input("Do you want to play again? Y/n ")
if play_again.lower() != 'n':
game()
else:
print("Bye!")
game()
Thank you so much in advance!
4 Answers
Christian Mangeng
15,970 PointsHi Bruno,
the error occurs because "guess" in your case is only defined if the try statement succeeds. This is because you defined it inside the try clause. You could define guess outside of the try/except clause and then just check for guess = int(guess) inside try
Kevin Akpomuje
1,357 PointsI have the same error as Bruno (the original poster) and I tried to follow your advice Christian. But unfortunatly, it doesn't work for me. Can you please check my code and tell me what I did wrong? Thanks in advance.
Error message:
Welcome to the world's greatest number guessing game: RN
In Beginner's Mode you have five tries to find the correct number
Guess a number between 1 and 10: a
Traceback (most recent call last):
File "number_game.py", line 51, in <module>
game()
File "number_game.py", line 20, in game
guess = int(input("Guess a number between 1 and 10: "))
ValueError: invalid literal for int() with base 10: 'a
My code looks like this:
'''python
# To-Do 09.07.2017
import random
def game():
# generate a random number between 1 and 10
secret_num = random.randint(1, 10)
# Introduce the player to game
print("Welcome to the world's greatest number guessing game: RN")
print("In Beginner's Mode you have five tries to find the correct number")
max_guess = []
while len(max_guess) < 5:
guess = int(input("Guess a number between 1 and 10: "))
try:
# get number the form user and check if its an integer!
guess = int(guess)
except ValueError:
print("Not {}! Please, only use numbers between 1 - 10".format(guess))
continue
else:
# compare guess to secret number
if guess == secret_num:
print("You got it! My number was {}".format(secret_num))
break
# print hit/miss
elif guess > secret_num:
print("{} is too high, try a lower number".format(guess))
else:
print("{} is too low, try a high number".format(guess))
# increase number of wrong guesses
max_guess.append(guess)
# print this when user didn't get the number at all!)
else:
print("You didn't guess my number: {}! Better luck next time".format(secret_num))
play_again = input("Do you want to play again? Enter Y/n to continue: ")
if play_again.lower() != 'n':
game()
else:
print("Thank you for playing RN the world's greatest number guessing game!")
game()
# End of code
'''
Ismail KOÇ
1,748 PointsHi Kevin i solved your problem
#Before
while len(max_guess) < 5:
guess = int(input("Guess a number between 1 and 10: "))
try:
# get number the form user and check if its an integer!
guess = int(guess)
except ValueError:
print("Not {}! Please, only use numbers between 1 - 10".format(guess))
continue
#and Now
while len(max_guess) < 5:
user_input = input("Guess a number between 1 and 10: ")
try:
# get number the form user and check if its an integer!
guess = int(user_input)
except ValueError:
print("Not {}! Please, only use numbers between 1 - 10".format(user_input))
continue
we could not use guess variable because guess variable broken and not available for print
Kevin Akpomuje
1,357 PointsThanks a whole bunch Ismail !
Ismail KOÇ
1,748 PointsNothing, can you upvote my answer?
Kevin Akpomuje
1,357 PointsSorry, I just read your post Ismail. I don't know how to upvote your answer :(
Ismail KOÇ
1,748 PointsYou can see number right of another comment (without yours) and if you click a symbol(looks likes this : ^) (top of the number) you can upvote a comment
Bruno Correia
3,114 PointsBruno Correia
3,114 PointsThank you Christian, that does make sense! I have tried how you suggested and it's working! :)
Steef Vendy
977 PointsSteef Vendy
977 PointsI still don't get it can you please specify the code?