Why is this outpout?

Question

a = ["hello","little","dog"]
a.append(a)
print (a)

outpout:
['hello' , 'little', 'dog' [...]]

Answer 1

To get the output you want use extend:

a.extend(a)

Answer 2

I expected this outpout ['hello', 'little', 'dog','hello', 'little', 'dog']

Answer 3

thanks

Answer 4

Since the list contains itself, the output would be infinite. In order to avoid that they replace the "nested" list by [...] (I'm guessing).