Python Simple confusion for the del instuction

[Steve389]

[CODE lang="python" title="del instruction" highlight="5-6"]hatList = [1, 2, 3, 4, 5]

hatList[2] = input(int("Enter an integer number: )")

del hatList[4]
del hatList[-1]

print("Lists content: ", hatList)
[/CODE]

I don't know If I am being stupid but does the del instruction produce a traceback error for line 5 but works for line 6?

 

[LTomy]

Hello Steve389!

The reason is that the index '-1' is invalid. The first element of an array is located at the index '0'. You are trying to delete a non-existing element, thus the error.

Wait... Are you sure the problem is at line 5 and not 6??

Also, it should be:

hatList[2] = int(input("Enter an integer number: "))

Instead of:

hatList[2] = input(int("Enter an integer number: )")

You want to convert the string returned by 'input' into an integer, not the argument given to it.

 

[Steve389]

Sorry, I didn't notice that the them being the wrong way round! thank you for telling me.

Also your fix with the mix up in the int and input has fixed the issues. It works for either '[4]' or '[-1]'. According to my python course -1 isn't invalid because negative values i.e. [-1] starts from the last line in the list and work backwards.

I appreciate your help, it was very useful!

 

[LTomy]

Sorry, I didn't notice that the them being the wrong way round! thank you for telling me.

Also your fix with the mix up in the int and input has fixed the issues. It works for either '[4]' or '[-1]'. According to my python course -1 isn't invalid because negative values i.e. [-1] starts from the last line in the list and work backwards.

I appreciate your help, it was very useful!

Glad I helped! I did not know for the [-1], I do not really code in Python, so I assumed it was like in C++ haha 😉