[Tutor] creating a dictionary for capital quiz program

[Peter Otten]

Alan Gauld wrote:

> On 02/06/15 15:15, Peter Otten wrote:
> 
>> Not an optimization, but if the user enters neither Y nor N you might ask
>> again instead of assuming Y.
> 
> He does. He only breaks if the user enters N
> 
>>>          choice = input('Do you want to play again y/n: ')
>>>          if choice.upper() == 'N':
>>>              print('end of game')
>>>              break
>>>          elif choice.upper() != 'Y':
>>>              print("invalid choice")
> 
> Y goes round again silently.
> Anything other than Y or N prints the error then tries again.

... with the next state. I meant that instead the question "Do you want to 
play again y/n:" should be repeated until there is a valid answer, either y 
or n.

Current behaviour:

$ python capitals.py 
Enter the capital of Mississippi :Jackson
Correct
Do you want to play again y/n: x
invalid choice
Enter the capital of Oklahoma :
...

So "x" is a synonum for "n".

Suggested behaviour:

$ python capitals.py 
Enter the capital of Mississippi :Jackson
Correct
Do you want to play again y/n: x
invalid choice
Do you want to play again y/n: z
invalid choice
Do you want to play again y/n: n
end of game
...