Error while concatenating lists in python

Question

I am working on an assignment for one of my classes at school where I need to concatenate two lists together. I am using the code:

flowers = ["rose", "bougainvillea", "yukka", "marigold", "daylily", "lily of the valley"]

thorny = flowers[0:3]
poisonous = flowers[-1]
dangerous = flowers[0:3] + flowers[-1]

I keep getting the error message:

dangerous = list(set(flowers[0:3] + flowers[-1]))   
TypeError: can only concatenate list (not "str") to list

I was wondering why this doesn't work. Thanks!

dangerous = flowers[0:3] + flowers[-1:]

Ozgur Vatansever
– Ozgur Vatansever

2016-09-06 04:41:43 +00:00
Commented Sep 6, 2016 at 4:41 — Ozgur Vatansever
– Ozgur Vatansever, Commented Sep 6, 2016 at 4:41

bananafish · Accepted Answer · 2016-09-06 04:40:28Z

7

flowers[0:3] returns a list while flowers[-1] returns a string, so you are adding a string to a list. You can use flowers[-1:] to return a list instead.

answered Sep 6, 2016 at 4:40

bananafish

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