An Armstrong number is equal to the sum of its own digits each raised to the power of the number of digits. For example, 370 is an Armstrong number because 333  777  000  370. Armstrong numbers are also called Narcissistic numbers and Pluperfect numbers. OnLine Encyclopedia of Integer Sequences entry: https:oeis.orgA005188 Return True if n is an Armstrong number or False if it is not.  allarmstrongnumbern for n in PASSING True  anyarmstrongnumbern for n in FAILING False Initialization of sum and number of digits. Calculation of digits of the number Dividing number into separate digits and find Armstrong number Return True if n is a pluperfect number or False if it is not  allarmstrongnumbern for n in PASSING True  anyarmstrongnumbern for n in FAILING False Init a histogram of the digits Return True if n is a narcissistic number or False if it is not.  allarmstrongnumbern for n in PASSING True  anyarmstrongnumbern for n in FAILING False check if sum of each digit multiplied expo times is equal to number Request that user input an integer and tell them if it is Armstrong number.
PASSING = (1, 153, 370, 371, 1634, 24678051, 115132219018763992565095597973971522401)
FAILING: tuple = (-153, -1, 0, 1.2, 200, "A", [], {}, None)


def armstrong_number(n: int) -> bool:
    """
    Return True if n is an Armstrong number or False if it is not.

    >>> all(armstrong_number(n) for n in PASSING)
    True
    >>> any(armstrong_number(n) for n in FAILING)
    False
    """
    if not isinstance(n, int) or n < 1:
        return False

    # Initialization of sum and number of digits.
    total = 0
    number_of_digits = 0
    temp = n
    # Calculation of digits of the number
    number_of_digits = len(str(n))
    # Dividing number into separate digits and find Armstrong number
    temp = n
    while temp > 0:
        rem = temp % 10
        total += rem**number_of_digits
        temp //= 10
    return n == total


def pluperfect_number(n: int) -> bool:
    """Return True if n is a pluperfect number or False if it is not

    >>> all(armstrong_number(n) for n in PASSING)
    True
    >>> any(armstrong_number(n) for n in FAILING)
    False
    """
    if not isinstance(n, int) or n < 1:
        return False

    # Init a "histogram" of the digits
    digit_histogram = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
    digit_total = 0
    total = 0
    temp = n
    while temp > 0:
        temp, rem = divmod(temp, 10)
        digit_histogram[rem] += 1
        digit_total += 1

    for cnt, i in zip(digit_histogram, range(len(digit_histogram))):
        total += cnt * i**digit_total

    return n == total


def narcissistic_number(n: int) -> bool:
    """Return True if n is a narcissistic number or False if it is not.

    >>> all(armstrong_number(n) for n in PASSING)
    True
    >>> any(armstrong_number(n) for n in FAILING)
    False
    """
    if not isinstance(n, int) or n < 1:
        return False
    expo = len(str(n))  # the power that all digits will be raised to
    # check if sum of each digit multiplied expo times is equal to number
    return n == sum(int(i) ** expo for i in str(n))


def main():
    """
    Request that user input an integer and tell them if it is Armstrong number.
    """
    num = int(input("Enter an integer to see if it is an Armstrong number: ").strip())
    print(f"{num} is {'' if armstrong_number(num) else 'not '}an Armstrong number.")
    print(f"{num} is {'' if narcissistic_number(num) else 'not '}an Armstrong number.")
    print(f"{num} is {'' if pluperfect_number(num) else 'not '}an Armstrong number.")


if __name__ == "__main__":
    import doctest

    doctest.testmod()
    main()
