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Python Python Basics (Retired) Things That Count Exceptions

Bug in the code in example

If you notice, as the index starts with a 0, when we use percentage, it actually has one number more than actual index value.

For e.g. if I give the user_num as 0.8 (80%) for a 5 letter world (e.g. 'house'), we notice that ideally the output should have been 4th letter 's', but in case as it refers to index, the output number would be 'e'.

So I think so we need to modify the code,to add a '-1' and put it as below.

if not '.' in user_num: print(user_string[our_num-1]) else: ratio = round(our_num*len(user_string)) print(len(user_string)) print(user_string[ratio-1])

1 Answer

Will Beasley
Will Beasley
6,020 Points

True it is a bug but not for that reason. The bug presents itself when you go outside the bounds of the list. This happens when you hit .91<=. Also, while you are on the right track yours would throw an error if a user enters .1 >. To fix it you would really need a nested if statement to the effect of

if(ratio < .1): ratio = round(our_num*len(user_string)) print(len(user_string)) print(user_string[ratio]) else: ratio = round(our_num*len(user_string)) print(len(user_string)) print(user_string[ratio-1])

Additionally, you wouldn't need to add a -1 for when a user enters an int. For two reasons. First, it is directly accessing an element in the list so that isn't a problem. Second, for the reason listed above. If the user enters '0' that would take them outside the bounds of the list. Hope that helped!