🔒 deleting long label

[boreal wharf]

i have an array which gathers user input which is like 60 letters long. how to delete it in array?

[remote hinge]

@boreal wharf

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[grand marten]

i think we need more context
show us your code for example

[boreal wharf]

this will be in kivy, can u send me the quote like, i cant find it in my keyboard

ill put comment to these ideas

[grand marten]

!code

[remote hinge]

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[grand marten]

you got them up there

[boreal wharf]

from kivymd.app import MDApp
from kivy.core.window import Window
from kivymd.uix.menu import MDDropdownMenu
from kivymd.uix.card import MDCard
from kivymd.uix.label import MDLabel
from kivy.clock import Clock

Window.size = (360, 600)

class MyApp(MDApp):
    def build(self):
        self.data=[]
        return


    def GoToSecondScreen(self):
        self.root.current = 'second'
    def GoToFirstScreen(self):
        self.root.current = 'first'    

        
    # for My DropDown



    def open_menu(self, caller):
        menu_items = [
            {"text": "About", "on_release": lambda: self.menu_callback("About Us")}
        ]
        self.menu = MDDropdownMenu(
            caller=caller,
            items=menu_items,
            width_mult=4,
        )
        self.menu.open()

    def menu_callback(self, text_item):
        print(f"You selected: {text_item}")
        self.menu.dismiss()

    
    # for my function e.g add, update, delete
    def add_card(self):
        text = self.root.ids.TextField.text.strip()
        if text == '':
            return
        self.data.append(text)

        card = MDCard(
        size_hint=(0.45, None),  # width relative, height fixed
        height=150,
        radius=15,
        md_bg_color=(0, 1, 0, 1)
        )
        card.add_widget(MDLabel(text=text, halign="center"))

        #my idea is if i click this label i want to have an ability to delete it.
        #it is storing 50letters more or so.

        self.root.ids.listview.add_widget(card)

        self.root.ids.TextField.text = ""


MyApp().run()

this is a todo list app

@grand marten

got an idea?

[slate jasper]

So you want to delete a particular index of array when a certain event is triggered?

[boreal wharf]

yes

that's it

Can you offer an easier way?

[slate jasper]

If you're using list, just use
my_list.pop(index)

You can also use
del my_list[index]

[boreal wharf]

wouldn't that be ineffective?

i mean. a user will just normally select a UI and deletes it

[grand marten]

a little bit if you have very long lists

[slate jasper]

Yes, It can take O(N) time

[grand marten]

but that is the nature of lists

[boreal wharf]

wdym?

[grand marten]

but for short lists in an app like this it shouldn't be any problems

[boreal wharf]

can u give me a sample?

[slate jasper]

You can you Linked list if you want, but then accessing any particular block will take O(N) time

[boreal wharf]

how can a user delete specific data with index

[grand marten]

you must know the index of the element that you want to delete from the list

[boreal wharf]

i still not very familiar with linked list even tho i can create node i still can't imagine any use of it

[grand marten]

i wouldn't worry too much about performance of a list in the context of a to-do gui app

[slate jasper]

See, I have a better idea... Use a dictionary, for every entry you take, store it with certain key and value.... When delete event is triggered, find out which key is to be deleted and remove it from dict

[boreal wharf]

can u suggest another way of deleting?

[boreal wharf]

that's what im thinking, storing it in another variable when clicked and then delete the match but i dont know how

[grand marten]

as @slate jasper mentioned, dictionaries are better if you need fast access and ability to remove any entry in an efficient way

but as i said, just forget about the performance aspect of it all

[boreal wharf]

can u give me a sample? i just need to have the grasp of it and theoritically apply it later

[boreal wharf]

its a project i need the full performance

[grand marten]

your coding a gui application in python, if performance was a top priority you probably wouldn't be using python in the first place

[grand marten]

if you do, you'll notice, first implement something that works

[boreal wharf]

performance over aesthetics were the instruction

[grand marten]

instructions from?

[boreal wharf]

instructor

[slate jasper]

# Dictionary to store values
data = {}
key_counter = 1  # To assign incremental keys


def add_value(value):
    global key_counter
    data[key_counter] = value
    key_counter += 1


def delete_value(key):
    if key in data:
        data.pop(key)
    else:
        print(f"Key {key} not found!")

Example

add_value("apple")
add_value("banana")
delete_value(1)
print(data)  # {2: 'banana'}

This will have better performance

[boreal wharf]

how can i assign value 1 when in interfac?

[grand marten]

it picks the id for new items from the counter

the counter always counts up for each item that is added

[slate jasper]

When a user add a todo, assign a id to that task.... Store the task as value and id as key in dictionary, when a user presses delete, find out the id in dictionary and delete it

[grand marten]

when deleting items there will be a gap in the ids, but that shouldn't matter

[boreal wharf]

can u show me a sample?

[grand marten]

they did, above

[boreal wharf]

i thoght dictionary is this

key : values inside array

[boreal wharf]

wait, wouldn't this just deletes the last item added?

[grand marten]

it is (the {"key": "value"} thing, kind of), but not inside an array
and what you are calling "array" is named "list" in python

[slate jasper]

import random
import string

tasks = {}

def generate_id():
    return ''.join(random.choices(string.ascii_uppercase + string.digits, k=4))

def add_task(task):
    task_id = generate_id()
    tasks[task_id] = task
    print(f"Task added: {task_id} -> {task}")
    return task_id

def delete_task(task_id):
    if task_id in tasks:
        removed = tasks.pop(task_id)
        print(f"Task deleted: {task_id} -> {removed}")
    else:
        print(f"No task found with ID {task_id}")


# Example usage
task = input("Add your task: ")
task_id = add_task(task)

print("\nAll tasks:", tasks)

# Example delete call
# delete_task(task_id)

[slate jasper]

No it won't, you need to give key to it, if you passed 1, it will delete 1st item added

[boreal wharf]

i get it now so how can i pass id in generate id every add of element of list and how can i select that specific id just by clicking something

[slate jasper]

See... Whats happening here is
When a user is giving some input, it is generating a random id using generate_id() function and assigns that id to that particular input from user and adds it in dictionary... What you need to do is just pass that particular generated id in delete_task() function and it will remove that task as well

You can make it trigger through frontend using flask or fastapi

[boreal wharf]

Aight

thanks

[remote hinge]

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