Python code. Name error with input module

Question

Here is the code I am working with. I'm working with two sets of code. When I combine the code into one program, it works the way it is supposed to. When I attempt to import the "arithemtics" module, it will not define the variables. I have spent many hours trying to figure this out and I fear it's something extremely simple

import arithmetics


def main():
    num1 = float(input('Enter a number:'))
    num2 = float(input('Enter another number:'))

    total(num1,num2)
    difference(num1,num2)
    product(num1,num2)
    quotient(num1,num2)

main()

Here is the "arithmetics"input module

def total(num1,num2):
    total = num1 + num2
    print(format(total, ',.1f'))


def difference(num1,num2):
    difference = num1 % num2
    print(format(difference, ',.1f'))

def product(num1,num2):
    product = num1 * num2
    print(product)

def quotient(num1,num2):
    quotient = num1 / num2
    print(quotient)

Answer 1

import arithmetics


def main():
    num1 = float(input('Enter a number:'))
    num2 = float(input('Enter another number:'))

    arithmetics.total(num1,num2)
    arithmetics.difference(num1,num2)
    arithmetics.product(num1,num2)
    arithmetics.quotient(num1,num2)

main()

This is because the functions are within the arithmetics module, they are not globally accessible just by doing import arithmetics , the functions within arithmetics needs to be called with the module name followed by the function name like this arithmetics.<function> .

Or you could do:

from arithmetics import *

This will import all the functions from arithmetics into the scope of your script as if they were defined within the script itself.

Note that doing a from x import * (particularly the star in this case) is not the most elegant or efficient way of doing things, if possible try to import only the functions you need from a library (in your case a star will work because you're using all the functions anyway, but other libraries might be big and you might not need all the functions).

To do this you can do:

from arithmetics import total, difference, product, quotient

Answer 2

if you use

import arithmetics

You'll need to qualify the function names like this

arithmetics.total
arithmetics.difference
arithmetics.product
arithmetics.quotient

Alternatively

from arithmetics import total, difference, product, quotient

Then the names can be used normally in your module

The 3rd alternative

from arithmetics import *

Is discouraged as it's not explicit and could cause mysterious breakage when someone adds some more names to arithmetics that can cause conflicts