[Python] Assertion Error vs Assert in pytest, why do I get different error messages when...

I have following dummy test cases in python and I am trying to have a better understanding of the error messages produced by pytest.

when I run these 4 test cases I get the following errors

FAILED test_assert_false_2 - AssertionError: assert 'abc' in 'defab'

FAILED test_1 - assert 0

FAILED test_2 - assert 3 < 2

FAILED test_3 - assert 1 > 2


why do I get AssertionError in first case and just assert in following cases

def test_assert_false_2():
assert 'abc' in 'defab'

def test_1():
assert 1
assert 0

def test_2():
assert 3 < 2

def test_3():
a = 2
b = 1
assert b > a

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