I can't understand these code

Question

code1 :
a = [1]
func = (lambda x: x.append("a")) and (lambda x: x.append("b"))
func(a)
print(a)
out put is [1,"b"]
code2:
a = [1]
func = (lambda x: x.append("a")) or (lambda x: x.append("b"))
func(a)
print(a)
out put is [1,"a"]

I don't understand. why the out put of code 1 is not [1,"a","b"]
anyone can tell me how the code run? Thanks.

Answer 1

Because and operator works in this way, when the first operand is true, it returns the second operand.