Challenge using python insert method

Question

i am trying my hands on some python list practice question. i tried to insert a new name mike at index "-1" but upon printing output to the screen i noticed it defaulted to another position (index (-2))in the dinner list.

dinner = ['yemi', 'bimpe', 'kola', 'kunle', 'bola', 'shola', 'ola']

invite = f"{dinner[0].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[-1].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[-3].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[3].title()}, would you be available to attend our dinner party?"
print(invite)

invite = f"{dinner[1].title()}, would you be available to attend our dinner party?"
print(invite)

not_coming = f"{dinner[0].title()} said she can't make the dinner party tonight and has to be swapped with {dinner[1].title()}"
print(not_coming)

not_coming = f"{dinner[-1].title()} said she can't make the dinner party tonight and has to be swapped with {dinner[-2].title()}"
print(not_coming)

dinner.insert(0, "kingsley")
print(dinner)

dinner.insert(-1, "mike")
print(dinner)

why is this so?

the list name is "dinner" enter image description here

azro · Accepted Answer · 2020-09-06 09:06:55Z

1

The documentation of list.insert states

Insert an item at a given position. The first argument is the index of the element before which to insert

So if you use the index -1, it'll insert just before the last one

To insert last use either one of these

dinner.insert(len(dinner), "mike")
dinner.append("mike")

answered Sep 6, 2020 at 9:06

azro

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2 Comments

yuppie sam Over a year ago

Thanks so much. I got clarity now.

azro Over a year ago

@yuppiesam you can think about accepting the answer so ;)

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