Why a == [1,2,[1,2]] is False ? or Why a == [1,2,[1,2]] is not True ?

Question

a = [1,2]
print(a)
a.append(a)
print(a)
print(a == [1,2,[1,2]])

Answer 1

THANGARAJU SIBIRAJ a = [1,2] , how a.append = [1,2,[...]] ?

Answer 2

THANGARAJU SIBIRAJ [1,2,[...]] It seems like an infinity.
Why this infinity is arising and I am expecting an answer [1,2,[1,2]].