Python

arr_test = ["thetung1","thetung2","thetung3"]
title = "thetung"
if title not in arr_test:
	arr_test.append(title)

N = [2,3,5]
P = 5

type(N).__name__ == 'list'
True

type(P).__name__ == 'int'
True

type(N).__name__ in ('list', 'tuple')
True

array = [1,2,3,4]
exists_2 = 2 in array
print(exists_2) # True
exists_5 = 5 in array
print(exists_5) # False

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