Float divmod python ошибка

Задача: Напишите простой калькулятор, который считывает с пользовательского ввода три строки: первое число, второе число и операцию, после чего применяет операцию к введённым числам («первое число» «операция» «второе число») и выводит результат на экран.

Поддерживаемые операции: +, -, /, *, mod, pow, div, где
mod — это взятие остатка от деления,
pow — возведение в степень,
div — целочисленное деление.

Проблема: При операциях с нулем возвращает:
Traceback (most recent call last):
File «jailed_code», line 9, in
print(n1 % n2)
ZeroDivisionError: float modulo

Мой код:

n1 = float(input())
n2 = float(input()
o = str(input())

if o == 'mod':
    if (n1 or n2) == 0.0:
        print("Деление на 0!")
    else:
        print(n1%n2)
elif o == 'div':
    if (n1 or n2) == 0.0:
        print("Деление на 0!")
    else:
        print(n1//n2)  
elif o == '/':
    if (n1 or n2) == 0.0:
        print("Деление на 0!")
    else:
        print(n1/n2)        
elif o == '*':
    print(n1 * n2)
elif o == '+':
    print(n1 + n2)
elif o == '-':
    print(n1 - n2)
elif o == 'pow':
    print(n1 ** n2)
else:
    print('Something was wrong')

The divmod() method in python takes two numbers and returns a pair of numbers consisting of their quotient and remainder. 

Syntax : 

divmod(x, y)
x and y : x is numerator and y is denominator
x and y must be non complex

Examples:  

Input : x = 9, y = 3
Output :(3, 0)

Input : x = 8, y = 3
Output :(2, 2)

Explanation: The divmod() method takes two parameters x and y, where x is treated as numerator and y is treated as the denominator. The method calculates both x // y and x % y and returns both the values. 

• If x and y are integers, the return value is

(x // y, x % y)

• If x or y is a float, the result is

(q, x % y), where q is the whole part of the quotient.

Output: 

(5, 4) =  (1, 1)
(10, 16) =  (0, 10)
(11, 11) =  (1, 0)
(15, 13) =  (1, 2)
(6.0, 5) =  (2.0, 2.0)
(3, 9.0) =  (0.0, 3.0)
(13.5, 6.2) =  (3.0, 0.0)
(1.6, 10.7) =  (5.0, 0.10000000000000009)

Errors And Exceptions 

1. If either of the arguments (say x and y), is a float, the result is (q, x%y). Here, q is the whole part of the quotient.
2. If the second argument is 0, it returns Zero Division Error
3. If the first argument is 0, it returns (0, 0)

Practical Application: Check if a number is prime or not using divmod() function.  

Examples: 

Input : n = 7
Output :Prime

Input : n = 15
Output :Not Prime

Algorithm 

1. Initialise a new variable, say x with the given integer and a variable counter to 0
2. Run a loop till the given integer becomes 0 and keep decrementing it.
3. Save the value returned by divmod(n, x) in two variables, say p and q
4. Check if q is 0, this will imply that n is perfectly divisible by x, and hence increment the counter value
5. Check if the counter value is greater than 2, if yes, the number is not prime, else it is prime

Output: 

Not Prime

More Applications: 

Example 1: 

Output: 

14

Example 2:

Output: 

231 

Syntax

object.__divmod__(self, other)

The Python __divmod__() method implements the built-in divmod operation. So, when you call divmod(a, b), Python attempts to call x.__divmod__(y). If the method is not implemented, Python first attempts to call __rdivmod__ on the right operand and if this isn’t implemented either, it raises a TypeError.

We call this a “Dunder Method” for “Double Underscore Method” (also called “magic method”). To get a list of all dunder methods with explanation, check out our dunder cheat sheet article on this blog.

Background Default divmod()

Python’s built-in divmod(a, b) function takes two integer or float numbers a and b as input arguments and returns a tuple (a // b, a % b). The first tuple value is the result of the integer division a//b. The second tuple is the result of the remainder, also called modulo operation a % b. In case of float inputs, divmod() still returns the division without remainder by rounding down to the next round number.

To understand this operation in detail, feel free to read over our tutorial or watch the following video:

Example Custom divmod()

In the following example, you create a custom class Data and overwrite the __divmod__() method so that it returns a dummy string when trying to calculate the modulo of two numbers.

class Data:
        
    def __divmod__(self, other):
        return '... my result of divmod...'


a = Data()
b = Data()
c = divmod(a, b)

print(c)
# ... my result of divmod...

If you hadn’t defined the __divmod__() method, Python would’ve raised a TypeError.

How to Resolve TypeError: unsupported operand type(s) for divmod()

Consider the following code snippet where you try to divide two custom objects without defining the dunder method __truediv__():

class Data:
    pass


a = Data()
b = Data()
c = divmod(a, b)

print(c)

Running this leads to the following error message on my computer:

Traceback (most recent call last):
  File "C:UsersxcentDesktopcode.py", line 7, in <module>
    c = divmod(a, b)
TypeError: unsupported operand type(s) for divmod(): 'Data' and 'Data'

The reason for this error is that the __divmod__() method has never been defined—and it is not defined for a custom object by default. So, to resolve the TypeError: unsupported operand type(s) for divmod(), you need to provide the __divmod__(self, other) method in your class definition as shown previously:

class Data:
        
    def __divmod__(self, other):
        return '... my result of divmod...'

Of course, you’d use another return value in practice as explained in the “Background divmod()” section.

Python __divmod__ vs __rdivmod__

Say, you want to calculate the divmod of two custom objects x and y:

print(divmod(x, y))

Python first tries to call the left object’s __divmod__() method x.__divmod__(y). But this may fail for two reasons:

1. The method x.__divmod__() is not implemented in the first place, or
2. The method x.__divmod__() is implemented but returns a NotImplemented value indicating that the data types are incompatible.

If this fails, Python tries to fix it by calling the y.__rdivmod__() for reverse divmod on the right operand y.

If this method is implemented, Python knows that it doesn’t run into a potential problem of a non-commutative operation. If it would just execute y.__divmod__(x) instead of x.__divmod__(y), the result would be wrong because the divmod operation is non-commutative (neither the integer division, nor the modulo operation is commutative). That’s why y.__rdivmod__(x) is needed.

So, the difference between x.__divmod__(y) and x.__rdivmod__(y) is that the former calculates (x // y, x % y) whereas the latter calculates (y // x, y % x) — both calling the respective divmod method defined on object x.

You can see this in effect here where we attempt to call the divmod operation on the left operand x—but as it’s not implemented, Python simply calls the reverse divmod operation on the right operand y.

class Data_1:
    pass

class Data_2:
    def __rdivmod__(self, other):
        return 'called divmod'


x = Data_1()
y = Data_2()

print(divmod(x, y))
# called divmod

References:

• https://docs.python.org/3/reference/datamodel.html

Explainer Video Modulo

You can also check out my explainer video where I’ll give you a deep dive on the built-in modulo operation and how to use them for various data types. Click to watch:

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 a = input()
f = float(a.replace(',','.'))
b = float(input())
c = input()
if b == 0 and (c == 'div' or 'mod' or '/'):
    print('Деление на 0!')
elif c == '+':
    print(f + b)
elif c == '-':
    print(f - b)
elif c == '*':
    print(f * b)
elif c == '/':
    print(f / b)
elif c == 'mod':
    print(f % b)
elif c == 'div':
    print(f // b)
elif c == 'pow':
    print(f ** b)

При вводных данных:
5
0
— или +

Выводит “Деление на 0!”
При

 if b == 0 and (c == 'div' or 'mod' or '/') and not(c == '-' or '+')

Вот такая штука с mod

 Test input:
5.0
0.0
mod 
Correct output:
Деление на 0!
Your code output:
Error:
Traceback (most recent call last):
  File "jailed_code", line 16, in <module>
    print(f % b)
ZeroDivisionError: float modulo

И вот такая с div

 Traceback (most recent call last):
  File "jailed_code", line 18, in <module>
    print(f // b)
ZeroDivisionError: float divmod()

Само задание для написание калькулятора:
Напишите простой калькулятор, который считывает с пользовательского ввода три строки: первое число, второе число и операцию, после чего применяет операцию к введённым числам (“первое число” “операция” “второе число”) и выводит результат на экран.

Поддерживаемые операции: +, -, /, *, mod, pow, div, где
mod — это взятие остатка от деления,
pow — возведение в степень,
div — целочисленное деление.

Если выполняется деление и второе число равно 0, необходимо выводить строку “Деление на 0!”.

Обратите внимание, что на вход программе приходят вещественные числа.