help me find out the logic behind tahe python lists

Question

l=[]
d=[]
d.append(0)
l.append(d)
print(d)
print(l)
d.append(1)
l.append(d)
print(d)
print(l)

the output here is
[0]
[[0]]
[0,1]
[[0,1],[0,1]] //""" it has to come this right [[0],[0,1]] """

why the does it happen

Answer 1

Edit :
Ok. Sry Now understood your question. Corrected now..

d is list, a reference type so when appending, the function adds object type it references, not values. So it changing values everytime original references of d list changing.. So it is like
l =[[Refference of list d], [Refference of list d], [...].]
Since you are adding entire list of object type, not primitive type values..
So final list l is number times list d appended..

Naresh Gopanaboina

If you want add only list values, add by
l = l + d
for your expected output, write like as added as lists then use
l = l.append(d.copy())