I know this is basic but i actually don't even know what I've done wrong.
while True:
try:
end=int(input("If You Dont Want To Buy Anything Press 1 To Exit\nOr If You Would Like To Try Again Please Press 2"))
except ValueError:
print("\nPlease Enter Only 1 Or 2")
if end==1:
exit()
elif end==2:
continue
I have literally defined end at the start and yet the error is NameError: name 'end' is not defined I've even tried making end a global.
end is only assigned to if there was no ValueError. If int() raises an exception, then the assignment never takes place.
Either test for valid end values inside the try (so that you know no exception was raised), or assign a default value to end first.
For example, the following will not throw your exception and still prompt the user to re-enter the number if anything other than 1 or 2 was entered:
while True:
try:
end=int(input("If You Dont Want To Buy Anything Press 1 To Exit\nOr If You Would Like To Try Again Please Press 2"))
if end==1:
exit()
elif end==2:
break
except ValueError:
pass
print("\nPlease Enter Only 1 Or 2")
Note that I moved the print() to be outside the except block; it'll be printed if an exception was thrown or when no break or exit() was executed. Note that I used break here instead of continue to exit the while True loop; continue would just start the next iteration, prompting the user to enter a number again.
end still was assigned that number.Others have explained the problem; here's a canonical solution. This matches the way many of us regard the process: - grab a response - until I get a legal response - ... tell the user what's wrong - ... get a new response
input_prompt = "If You Don't Want To Buy Anything Press 1 To Exit\nOr If You Would Like To Try Again Please Press 2"
response = input(input_prompt)
while response != '1' and response != '2':
print("\nPlease Enter Only 1 Or 2")
response = input(input_prompt)
end = int(reponse)
This has no unnatural loop exits (harder to follow and maintain), and no exception processing (slow).
It tries to assign a value to end, but catches a ValueError and after the except it tries to see what 'end' is however it was never assigned a value due to the Exception.
If int(input(...)) fails, a ValueError is raised. That happens before end is assigned. Add another control statement in the error handling, for instance
while True:
try:
end=int(input("If You Dont Want To Buy Anything Press 1 To Exit\nOr If You Would Like To Try Again Please Press 2"))
except ValueError:
print("\nPlease Enter Only 1 Or 2")
continue # ask again
if end==1:
exit()
elif end==2:
continue
endis only assigned to if there was noValueError. Ifint()raises an exception, then the assignment never takes place.