How do I print a message if a ValueError occurs? - valueerror

Question

while answers_right < 3:
ran_number_1 = random.randint(10, 99)
ran_number_2 = random.randint(10, 99)
solution = ran_number_1 + ran_number_2
print(f"What is {ran_number_1} + {ran_number_2}?")
user_answer = int(input("Your answer: "))
if user_answer == solution:
answers_right += 1
print(f"Correct. You've gotten {answers_right} correct in a row.")
elif user_answer != solution:
answers_right = 0
print(f"Incorrect. The expected answer is {solution}.")
if answers_right == 3:
print("Congratulations! You've mastered addition.")
I want to add an additional if statement in case someone types string and return a message that says "Invalid Response" instead of the Traceback Error.

Answer 1

Use of Exception handling in python may be solve your Problem and you can also generate your own error class for particular condition.
if x < 3:
raise Exception("Sorry, no numbers below 3")
Use of throw and raise keyword you can generate your own error.
for more referencelink here

Answer 2

The correct way to solve this problem is to look at the error type in your traceback, and use a try/except block. It will say something like TypeError: error stuff here or ValueError: error stuff also here.
The way you do a try/except is to:
try:
some_code()
that_might()
produce_an_error()
except some_error_type:
do_stuff()
except_some_other_error_type:
do_other_stuff()
So, to catch a ValueError and a TypeError, you might do:
try:
buggy_code()
except ValueError:
print("Woah, you did something you shouldn't have")
except TypeError:
print("Woah, you did something ELSE you shouldn't have")
If you then want the traceback, you can add in a lone "raise" statement below the excepts. For example:
try:
buggy_code()
except ValueError:
print("Woah, you did something you shouldn't have")
raise
except TypeError:
print("Woah, you did something ELSE you shouldn't have")
raise
Errors have evolved to be a lot more useful in modern times. They don't break the entire system anymore, and there are ways of handling them. Try/Except blocks like the above give you the tools to have code that only executes when a specific error or set of errors is raised.