def contain_number(numbers, number):
    for currentNumber in numbers:
        if currentNumber == number:
            return True
    return False


data = [1, 2, 3]
isContain2 = contain_number(data, 2)
# isContain2 is True

isContain4 = contain_number(data, 4)
# isContain4 is False

print(f"{isContain2 = }")
print(f"{isContain4 = }")