list=[] list += "knock" list *=2 print(list)

Question

As I'm new to python so I'm struggling to learn even small programs on python. it would be nice someone explain me this problem
https://code.sololearn.com/c1LYW2C4cgvB/?ref=app

Answer 1

The '+' sign between a list and a string will split the string into characters and then append each character into the list.
If you want to add the whole string into the list use the append() function, or insert the string between brackets like
List += ["knock"]
Or list.append("knock")
The '*' operator, on a list, will repeat the reference of that list n times, like 2 times in this example.
Try the following example to understand what i mean by reference:

list = [["knock"]]
list *= 2
list[1][0] = 'abc'
print(list)
output:
[['abc'], ['abc']]

this is because the '*' operator has multiplied not only the value but the whole object(resulting two objects having the same reference). so list[0][0] is the same object as list[1][0].
python works like a wizard.

Answer 2

Bl@<K H@t the question is about explaining what is going on in the program instead of telling changes from list*=2 to list*=1will overcome a problem that doesn't even exist