CODEWITHSUNDEEP
pythoninputstorerepeat
Jaydreamer
Jaydreamer

Reputation: 95

Python - How do I get my program to ask for an input repeatedly but still store the other inputs?

Basically, my program needs to be able to store recipes. I have to ask the user to input an ingredient along with the quantity and unit. I'm sorry if this is somewhat vague, but how can I program it so that I can ask the user to input multiple ingredients until they've entered the number of ingredients that they need to enter? Thank you very much.

#Ask the user to input ingredient name, quantity and measurement

ingredient = input("Name is your ingredient: ")
ingredientquantity = int(input("What is the quantity of this ingredient: "))
ingredientunit = input("What is the unit of your ingredient: ")

^^^ This is what I've written so far, but how could this be repeated and STILL STORE any previous entries?

Upvotes: 0

Views: 10536

Answers (3)

Joran Beasley
Joran Beasley

Reputation: 113948

def validated_input(prompt,input_type=str):
    while True:
       try:
            return input_type(raw_input(prompt))
       except:
            print "Error Invalid Input, Try Again"

def get_ingredient():
    return validated_input("Ingredient Name:",str),validated_input("Qty:",int),validated_input("Units:",str)


ingredients = [get_ingredient() for _ in range(validated_input("Enter Number Of Ingredients:",int))]

Upvotes: 1

msvalkon
msvalkon

Reputation: 12077

Write a loop, and store them in a list. A while loop might be prudent here

ingredients = []
while True:
    name = raw_input("Name is your ingredient: ")
    quantity = int(raw_input("What is the quantity of this ingredient: "))
    unit = raw_input("What is the unit of your ingredient: ")
    ingredients.append((name, quantity, unit))

    cont = raw_input("Continue adding ingredients? [y/n]")
    if not cont.lower() in ("y", "yes"):
        break

The code will ask for the stuff you wanted, and append these as a three tuple to a list after each iteration. Now once you're done (by answering anything but a y or yes), you'll have a list of three tuples (ingredient name, ingredient quantity, ingredient unit).

Have a look at the data structures part in the official documentation.

Demo:

Name is your ingredient: Flour
What is the quantity of this ingredient: 7
What is the unit of your ingredient: dl
Continue adding ingredients? [y/n]y
Name is your ingredient: Butter
What is the quantity of this ingredient: 50
What is the unit of your ingredient: gr
Continue adding ingredients? [y/n]y
Name is your ingredient: Sugar
What is the quantity of this ingredient: 1
What is the unit of your ingredient: dl
Continue adding ingredients? [y/n]n

>>> print ingredients
[('Flour', 7, 'dl'), ('Butter', 50, 'gr'), ('Sugar', 1, 'dl')]

EDIT: Changed the input calls to raw_input because in python 2.7, input attempts to convert the input to whatever it thinks the input is. Thus numbers become integers and so forth. Not necessarily a good idea.

Upvotes: 4

Agate
Agate

Reputation: 3232

You can try something like:

data = []

i=0
max_cycles = 10
while i < max_cycles:

    ingredient = input("Name is your ingredient: ")
    ingredientquantity = int(input("What is the quantity of this ingredient: "))
    ingredientunit = input("What is the unit of your ingredient: ")
    data.append((ingredient, ingredientquantity, ingredientunit))

    print(data)

    i += 1

It wil iterate 10 times (max_cycles value) then break, and store all data as tuples inside data list.

Upvotes: 0

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