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I want to delete data from a JSON file using store.delete('key_of_dictionary') by selecting a label in RecycleView, then pressing a 'Delete' button.

I've made my code to select the labels, and get the value, but I cannot pass it to a method/function. The method must be in class SelectableLabel(...), as it seems. I'm not sure how to access that class.

I would appreciate any insight. Thank you in advance!

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label
from kivy.properties import BooleanProperty
from kivy.uix.behaviors import FocusBehavior
from kivy.storage.jsonstore import JsonStore
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from operator import itemgetter
import json

kv_string = """
ScreenManager:
 id: manager

 Screen:
 BoxLayout:
 orientation: 'vertical'
 canvas:
 Color:
 rgba: .2,.2,.5,1
 Rectangle:
 pos: self.pos
 size: self.size

 GridLayout:
 size_hint_y: .3
 cols:4
 MyButton:
 text: 'Rank'
 size_hint_x: 0.5
 MyButton:
 text: 'Ratings'
 MyButton:
 text: 'Name'
 size_hint_x: 2
 MyButton:
 text: 'Score'
 on_press:
 #arrange the boxing in ascending or descending order

 RecycleView:
 data: ['text': str(x) for x in app.new_new_sorted_data]
 viewclass: 'SelectableLabel'

 SelectableRecycleGridLayout:
 cols: 4
 default_size_hint: 1, None
 size_hint_y: None
 height: self.minimum_height
 orientation: 'vertical'
 multiselect: True
 touch_multiselect: True

 Button:
 size_hint_y: .3
 text: 'Press to Use Method'
 on_press:
 SelectableLabel().function()

<SelectableLabel>:
 canvas.before:
 Color:
 rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
 Rectangle:
 pos: self.pos
 size: self.size

<MyButton@Button>:
 background_color: 0,0,0,1
"""
class SelectableLabel(RecycleDataViewBehavior, Label):

 def function(self):
 print('Take the value in rv.data[index] if 4 % == 0 then donstore.delete(rv.data[index])')

 index = None
 selected = BooleanProperty(False)
 selectable = BooleanProperty(True)

 def refresh_view_layout(self, rv, index, layout, viewport):
 mod = index % 4
 size_hints = [(0.5, None), (1, None), (2, None), (1, None)]
 layout['size_hint'] = size_hints[mod]
 colors = (1,1,1,1), (1,1,1,1), (1,1,1,1), (0,1,1,1)
 layout['color'] = colors[mod]
 super(SelectableLabel, self).refresh_view_layout(rv, index, layout, viewport)

 def refresh_view_attrs(self, rv, index, data):
 self.index = index
 return super(SelectableLabel, self).refresh_view_attrs(
 rv, index, data)

 def on_touch_down(self, touch):
 if super(SelectableLabel, self).on_touch_down(touch):
 return True

 if self.collide_point(*touch.pos) and self.selectable:
 self.parent.select_with_touch(self.index, touch)
 if self.index % 4 == 0:
 self.parent.select_with_touch(self.index + 1)
 self.parent.select_with_touch(self.index + 2)
 self.parent.select_with_touch(self.index + 3)
 return
 elif self.index % 4 == 1:
 self.parent.select_with_touch(self.index + 1)
 self.parent.select_with_touch(self.index + 2)
 self.parent.select_with_touch(self.index - 1)
 return
 elif self.index % 4 == 2:
 self.parent.select_with_touch(self.index + 1)
 self.parent.select_with_touch(self.index - 2)
 self.parent.select_with_touch(self.index - 1)
 return
 elif self.index % 4 == 3:
 self.parent.select_with_touch(self.index - 1)
 self.parent.select_with_touch(self.index - 2)
 self.parent.select_with_touch(self.index - 3)
 return

 index_list = 

 def apply_selection(self, rv, index, is_selected):
 self.selected = is_selected

 if is_selected:
 self.index_list.append(rv.data[index]) if index % 4 == 0 else self.index_list
 print(self.index_list) if index % 4 == 0 else ''
 #print("selection changed to 0".format(rv.data[index]))
 else:
 try:
 self.index_list.remove(rv.data[index]) if index % 4 == 0 else self.index_list
 print(self.index_list) if index % 4 == 0 else ''
 #print("selection removed for 0".format(rv.data[index]))
 except:
 pass

class SelectableRecycleGridLayout(FocusBehavior, LayoutSelectionBehavior, RecycleGridLayout):
 pass

class MyApp(App):

 store = JsonStore('file.json')
 store.put('Example: 1', value_1 = 'Rating: C', value_2 = 10, value_3 = 'Zack')
 store.put('Example: 2', value_1 = 'Rating: C', value_2 = 13, value_3 = 'Kate')
 store.put('Example: 3', value_1 = 'Rating: A', value_2 = 32, value_3 = 'Pete')
 store.put('Example: 4', value_1 = 'Rating: B', value_2 = 24, value_3 = 'Toby')
 store.put('Example: 5', value_1 = 'Rating: D', value_2 = 03, value_3 = 'Lars')

# ---------------------- v Sorting Data v ----------------------

 json_data = open('./file.json')
 score_data = json.load(json_data)

 newlist = 
 newnewlist = 

 for x in score_data:
 newlist.append(x)

 for y in newlist:
 newnewlist.append(score_data[str(y)])

 print(newlist)
 print(newnewlist)

 sorted_data = sorted(newnewlist,key=itemgetter('value_2'), reverse = True)
 new_sorted_data = 

 for z in sorted_data:
 new_sorted_data.append(z.values())

 new_new_sorted_data = 

 for x,y,z in new_sorted_data:

 new_new_sorted_data.append(newlist.pop())
 new_new_sorted_data.append(x)
 new_new_sorted_data.append(y)
 new_new_sorted_data.append(z)

# ---------------------- ^ Sorting Data ^ ----------------------

 def build(self):
 root_widget = Builder.load_string(kv_string)
 return root_widget

if __name__ == "__main__":
 MyApp().run()

I finally got my sample code to do what I wanted. I went through the MyApp class to get to the SelectLabel class. I also found a way to delete specific JSON keys through RecycleView. I didn't comment this piece of code because it's just a sample, but if someone is using this as a reference and needs assistance, feel free to message me.

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.label import Label
from kivy.properties import BooleanProperty, ListProperty
from kivy.uix.behaviors import FocusBehavior
from kivy.storage.jsonstore import JsonStore
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from operator import itemgetter
import json

kv_string = """
ScreenManager:
 id: manager

 Screen:
 BoxLayout:
 orientation: 'vertical'
 canvas:
 Color:
 rgba: .2,.2,.5,1
 Rectangle:
 pos: self.pos
 size: self.size

 GridLayout:
 size_hint_y: .3
 cols:4
 MyButton:
 text: 'Rank'
 size_hint_x: 0.5
 MyButton:
 text: 'Ratings'
 MyButton:
 text: 'Name'
 size_hint_x: 2
 MyButton:
 text: 'Score'
 on_press:
 #arrange the boxing in ascending or descending order

 RecycleView:
 data: ['text': str(x) for x in app.new_new_sorted_data]
 viewclass: 'SelectableLabel'

 SelectableRecycleGridLayout:
 cols: 4
 default_size_hint: 1, None
 size_hint_y: None
 height: self.minimum_height
 orientation: 'vertical'
 multiselect: True
 touch_multiselect: True

 Button:
 size_hint_y: .3
 text: 'Press to Use Method'
 on_press:
 app.pre_function()

<SelectableLabel>:
 canvas.before:
 Color:
 rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
 Rectangle:
 pos: self.pos
 size: self.size

<MyButton@Button>:
 background_color: 0,0,0,1
"""
class SelectableLabel(RecycleDataViewBehavior, Label):

 index = None
 selected = BooleanProperty(False)
 selectable = BooleanProperty(True)

 def refresh_view_layout(self, rv, index, layout, viewport):
 mod = index % 4
 size_hints = [(0.5, None), (1, None), (2, None), (1, None)]
 layout['size_hint'] = size_hints[mod]
 colors = (1,1,1,1), (1,1,1,1), (1,1,1,1), (0,1,1,1)
 layout['color'] = colors[mod]
 super(SelectableLabel, self).refresh_view_layout(rv, index, layout, viewport)

 def refresh_view_attrs(self, rv, index, data):
 self.index = index
 return super(SelectableLabel, self).refresh_view_attrs(
 rv, index, data)

 def on_touch_down(self, touch):
 if super(SelectableLabel, self).on_touch_down(touch):
 return True

 if self.collide_point(*touch.pos) and self.selectable:
 self.parent.select_with_touch(self.index, touch)
 if self.index % 4 == 0:
 self.parent.select_with_touch(self.index + 1)
 self.parent.select_with_touch(self.index + 2)
 self.parent.select_with_touch(self.index + 3)
 return
 elif self.index % 4 == 1:
 self.parent.select_with_touch(self.index + 1)
 self.parent.select_with_touch(self.index + 2)
 self.parent.select_with_touch(self.index -1)
 return
 elif self.index % 4 == 2:
 self.parent.select_with_touch(self.index + 1)
 self.parent.select_with_touch(self.index - 2)
 self.parent.select_with_touch(self.index -1)
 return
 elif self.index % 4 == 3:
 self.parent.select_with_touch(self.index - 1)
 self.parent.select_with_touch(self.index - 2)
 self.parent.select_with_touch(self.index - 3)
 return

 index_list = 

 def apply_selection(self, rv, index, is_selected):
 self.selected = is_selected

 if is_selected:
 self.index_list.append(rv.data[index]) if index % 4 == 0 else self.index_list
 #print("selection changed to 0".format(rv.data[index]))
 else:
 try:
 self.index_list.remove(rv.data[index]) if index % 4 == 0 else self.index_list
 #print("selection removed for 0".format(rv.data[index]))
 except:
 pass

class SelectableRecycleGridLayout(FocusBehavior, LayoutSelectionBehavior, RecycleGridLayout):
 pass

class MyApp(App):
 store = JsonStore('file.json')
 store.put('Example: 1', value_1 = 'Rating: C', value_2 = 10, value_3 = 'Zack')
 store.put('Example: 2', value_1 = 'Rating: C', value_2 = 13, value_3 = 'Kate')
 store.put('Example: 3', value_1 = 'Rating: A', value_2 = 32, value_3 = 'Pete')
 store.put('Example: 4', value_1 = 'Rating: B', value_2 = 24, value_3 = 'Toby')
 store.put('Example: 5', value_1 = 'Rating: D', value_2 = 03, value_3 = 'Lars')

# ---------------------- v Sorting Data v ----------------------

 new_new_sorted_data = ListProperty()

 def sort_data(self):
 try:
 self.store = JsonStore('file.json')
 self.new_new_sorted_data = 
 json_data = open('./file.json')
 score_data = json.load(json_data)

 newlist = 
 newnewlist = 

 for x in score_data:
 newlist.append(x)

 for y in newlist:
 newnewlist.append(score_data[str(y)])

 print(newlist)
 print(newnewlist)

 sorted_data = sorted(newnewlist,key=itemgetter('value_2'), reverse = True)
 new_sorted_data = 

 for z in sorted_data:
 new_sorted_data.append(z.values())


 for x,y,z in new_sorted_data:

 self.new_new_sorted_data.append(newlist.pop())
 self.new_new_sorted_data.append(x)
 self.new_new_sorted_data.append(y)
 self.new_new_sorted_data.append(z)
 except:
 pass
# ---------------------- ^ Sorting Data ^ ----------------------

# --------------------- v Deleting Data v ----------------------

 only_key_values_list = 
 only_key_values = 

 def pre_function(self):
 self.only_key_values_list = 
 self.only_key_values = 

 for value in SelectableLabel().index_list:
 self.only_key_values_list.append(value.values())
 for keys in self.only_key_values_list:
 for key in keys:
 try:
 self.store.delete(str(key))
 except:
 pass
 self.sort_data()


# --------------------- ^ Deleting Data ^ ----------------------
 def __init__(self, **kwargs):
 super(MyApp, self).__init__(**kwargs)
 self.sort_data()

 def build(self):
 root_widget = Builder.load_string(kv_string)
 return root_widget

if __name__ == "__main__":
 MyApp().run()