Help on a program to help with distributing food to the needy

[teenspirit]

This is now my progress on the program:

#! /usr/bin/env python3

#For use in the total() function.
from fractions import Fraction
#To use in time and date stamps in the file written by the total() function.
import time

def get_item_info(items):
    #Requests name and amount, amount in integer form.
    while True:
        item_name = input("Type the name of your food item here: ")
        item_units = input("Type the number of units of your item, just the number, here: ")
        #The next six lines makes sure that the user has enterred an integer in 
        try:
            value = int(item_units)
            break
        except ValueError:
            print('The number of units you entered: ', item_units, ' is not a normal number, please try entering it again.')
            continue
    #Writes the name and amount as the key and value in our dictionary.
    items[item_name] = int(item_units)
    #This prints the current list of items to the screen.
    for item, amount in items.items():
        print(item + ' ..... ' + str(amount))


#This function defines the process of adding new food items to the items dictionary.
def food_items(items):
    #This loop defines the user adding the items.
    while True:
        get_item_info(items)
        #After running the get_item_info function, this code will determine what the user will do next.
        next_step_option = input("Type 'a' to do another item, type 'm' to go to the main menu': ")
        #This statement says that if the input is 'a', it goes back to the top of our loop and recalls get_item_info(items)
        if next_step_option == 'a':
                print('Adding another food item')
        #This line exits to the main menu by breaking the loop, finishing the function call.
        elif next_step_option == 'm':
            break
        else:
            print('......An incorrect or blank character has been entered, try the last entry again.')

#Just a repepitive line that it isn't practical to keep writing over and over.
def show_sizes(large, small):
    print ('Large families: ', large, ' small families: ', small)
  
#This function defines the first input data and how to store that data.
def one_or_two(large, small):
    # instruction for quitting
    print("Press 'm' to go back to the main menu. Your data will be saved.")
    while True:
        letter = input("Is it a large family or small? Type l for large family, s for small: ").lower()
        if letter in ('s', 'small'):
            #adding to the value of small families 
            small = small + 1
            show_sizes(large, small)
        elif letter in ('l', 'large'):
            #adding to the value of large families
            large = large + 1
            show_sizes(large, small)
        #This exits back to the main menu by breaking the loop, finishing the function call.
        elif letter in ('m', 'main'):
            break
        else:
            print('......An incorrect or blank character has been entered, try the last entry again.')
        print()
    return large, small
  
#This function gives a tally with information when called and also writes it to a file.
def total(large, small):
    #We set local_time to equal the current time and date.
    timestr = time.strftime("%Y%m%d-%H%M")
    final_total = large + small
    #The following four lines print out a simple block of data.
    print('\n***There is a final total of ',final_total, ' families***')
    show_sizes(large, small)
    if small != 0:
        print('The ratio of large families to small families is: ' ,Fraction(large, small), ' large/small')
    else:
        print('The ratio of large families to small families is: ', large, '/0 large/small')
    print('{:.1%} of the families were large.'.format(large / final_total))

    
def final_total(large, small):
    total(large, small)

    #The next six lines make a filename that is time/date stamped and adds the specified information
    filename = 'food drive log'
    with open(filename + timestr + '.txt', 'a') as file_object:
        file_object.write('***There is a final total of ' + str(final_total) + ' families***\n')
        if small != 0:
            file_object.write('The ratio of large families to small families is: ' + str(Fraction(large, small)) + ' large/small\n')
        else:
            file_object.write('The ratio of large families to small families is: ' + str(large) + '/0 large/small\n')
        file_object.write('{:.1%} of the families were large.\n'.format(large / final_total))
        file_object.write('Large families: ' + str(large) + ' Small families: ' + str(small) + '\n')

#This function is the main menu and controller of the other functions we have defined.
def main():
    #Declaring the necessary variables and dictionary.
    large, small = 0, 0
    items = {}
    while True:
        #The following is our main menu that the user will see.
        userin = input("Type 'i' to enter new items, 'r' to begin registering new families, or 't' to get currnet total and stats, e is to exit: ")
        if userin == 'i':
            food_items(items)
        elif userin == 'r':
            large, small = one_or_two(large, small)
        elif userin == 't':
            total(large, small)
        elif userin == 'e':
            final_total(large, small)
            break
        else:
            print('An unknown option: ', userin, ' has been entered. Please try the last entry again.')

#Calling our main function to start running the primary protions of our program.
main()

As you can see i split the food_items(items) function into two seperate functions, so that it would properly exit to the main menu. 
I also made a new total(large, small) function removing the file writing from that function, adding that functionality to the new final_total(large, small) function. I followed some of the advice for minor changes that has been given to me, and cleaned up the commenting a little bit. If anyone has any further suggestions or would like to help with development, please, just let me know. I am going to add writing the contents of our items dictionary to the onscreen total function and to the final_total function to add to the data given and stored with those functions.