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A function that takes a word and a string of forbidden letters - pooyan89 - Jun-12-2019
Hi I have a question:
Write a function named avoids that takes a word and a string of forbidden letters, and that returns True if the word doesn’t use any of the forbidden letters.
The solution is :
def avoids(w,l):
for j in w:
if j in l:
return False
return TrueI know I can write this code in other ways as well but when I write :def avoids2(w,l):
for i in w:
if i not in l:
return True
return FalseI get True every time! avoids('word','o') gives me False which is correct!
avoids2('word','o') gives me True which is not correct!
WHY the avoids2 is not working correctly?
RE: A function that takes a word and a string of forbidden letters - Yoriz - Jun-12-2019
The loop stops straight away because w is not in 'o' so it returns True.
RE: A function that takes a word and a string of forbidden letters - pooyan89 - Jun-12-2019
(Jun-12-2019, 07:12 PM)Yoriz Wrote: The loop stops straight away because w is not in 'o' so it returns True.
But it is not so in the first case. Can you explain more ?!
RE: A function that takes a word and a string of forbidden letters - Yoriz - Jun-12-2019
In the first case it is checking if w is in 'o' which it is not so it doesn't return False,
moves on the the next letter in the loop, o is in 'o' so returns False.
RE: A function that takes a word and a string of forbidden letters - pooyan89 - Jun-12-2019
(Jun-12-2019, 07:23 PM)Yoriz Wrote: In the first case it is checking if w is in 'o' which it is not so it doesn't return False,
moves on the the next letter in the loop, o is in 'o' so returns False.
OK I have to read the return chapter carefully this time! thank you for the help
RE: A function that takes a word and a string of forbidden letters - nilamo - Jun-12-2019
As soon as you hit a return, the function is done and doesn't run through the rest of the for-loop. If you imagine a bus ride as a for loop, the return statement is like jumping off the bus before making it to the destination... you miss out on the rest of the bus ride.