Explain this Python code?

Question

def func(i ,x=[ ]):
x.append(i)
return x

print(func(1))
print(func(2))
print(func(3))

output : #[1]
#[1,2]
#[1,2,3]

https://code.sololearn.com/cDdML9IN8I7S/?ref=app

Answer 1

x=[ ] means an array.
It is left empty here.

Then a function 'func(i,x[ ])' is defined, in which 'x.append(I)' means you are adding 'i' to that array 'x[ ]'. And finally return x which is 'x=[i]', where 'i' represents number of elements of that array.

If you can explain it better, let us know.
Thanks, that's really great!