Need help with lists, tuples and 'for', 'in' tools

Python
1

hi all im new to python, just need help with this


tup0 = ('hi', '')
tup1 = ('hi1', '$ 1')
tup2 = ('hi2', '$ 2')
tup3 = ('hi3', '$30')

for i in ls:
    for j in i:
        print(entry.ljust(49), end='')
    print()

how can i change the code from where i marked so that i dont use ‘for’ and ‘in’ while producing the same output? any help is appreciated

2

what do you want to use if not a for loop?

3

a while loop if possible

4

what is ls? that is not visible in your code

5

ls = [tup0, tup1, tup2, tup3]

6

what are the characteristics of a while loop? what do you need to add to a while loop so that iterates over a list?

7

its just a restriction, i cannot use for loops, only while loops

item1 = 'Krusty Burger'
item2 = 'Milkshake'
item3 = 'Krusty Meal Set[Burger + Drink + Krusty Laugh]'
item1_cost = '5.10'
item2_cost = '3.50'
item3_cost = '10.50'

menu_list = [(item1, '$ ' + item1_cost), (item2, '$ ' + item2_cost), (item3, '$ ' + item3_cost)]

def get_menu():
    print('Welcome to Krusty Burgers!')

    # for items in menu_list:
    #     for test in items:
    #         print(test.ljust(49), end='')
    #     print()

    i = 0
    j = 0
    ls_item = menu_list[i]
    tup_item = menu_list[i][j]
    while i < len(menu_list):
        while j < i:
            print(tup_item.ljust(49), end='')
            j += 1
        print()
        i += 1

get_menu()

what i commented out works as intended, how can i make it so using while loops it produces the same output, u can see my attempt above

8

these written outside the loop, their value will never update. Maybe you want to put them where they can be updated?

9

You may look into using a for loop for this. Those two while loops are doing things that python can do for you.

Did you know that you can unpack a tuple into variables while iterating over a list of tuples in a for loop?

>>> list_of_tuples = [("one", "two")]
>>> for a, b in list_of_tuples:
...     print(a, b)
...
one two
>>>

If you intended for this output it can be done with a for loop and just one print statement after that:

Welcome to Krusty Burgers!
Krusty Burger                                     $ 5.10
Milkshake                                         $ 3.50
Krusty Meal Set[Burger + Drink + Krusty Laugh]    $ 10.50
10

as i said, im not allowed to use for loops, they are restricted in the question im doing. hence i need to use while loops or another method

11 
    i = 0
    j = 0
    while i < len(menu_list):
        ls_item = menu_list[i]
        while j < len(ls_item):
            tup_item = menu_list[i][j]
            print(tup_item.ljust(49), end='')
            j += 1
        print()
        i += 1

ive changed the code so that the tuple loop is now working, but the main loop to cycle through the list isnt unfortunately

12

SOLVED: check new thread for different problem

13

This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.