Shocking in-place operators 🔥🔥🔥🔥😱😱👌

Question

Recently I encountered this...
(But can't tell why in-place operators work that way)
Firstly without in-place operator
>>>list=[]
>>>list=list+"hello"
>>>print(list)
TypeError: can only concatenate list(not str) with list
Now with in-place operator
>>>list=[]
>>>list+="hello"
>>>print(list)
["h", "e", "l", "l", "o"]
So list+="hello" is not the same as saying list=list+"hello"

Answer 1

https://www.sololearn.com/discuss/1251023/?ref=app

Answer 2

Adding a list with a string and then assigning it back to a list, is different from appending a string to a list.
While
x += 5
is commonly explained to be a shorthand of
x = x + 5
which is true, different languages provide different shorthands for different purposes. So happens that += is defined as such in Python.