Why the append and concatenation (+) works differently for strings in list?

Question

s=[1,2,3]
s.append("text1")
s+="text2"
print(s)
[1, 2, 3, 'text1', 't', 'e', 'x', 't', '2'] rather than [1,2,3,'text1,'text2']

Answer 1

For list, Python is actually doing same thing behind the hood (appending)
When you do

s += "text2" it's short form of
for j in "text2":
s.append(j)

Thus,
If s = [ ]

s+="abcd" will give different result as s.append("abcd")