Change an attribute from an instance with a tkinter Listbox - python-3.x

Question

I am new here, and I am a beginner in tkinter. I want to change the attribute of a specific instance from a class. To select the instance, I want to use a Listbox. Here is simple version of the code for the creation of the Listbox. Is it possible to change the flag attribute of the selected instance (if apple is cliked on, change apple.flag to 1) ?
Thanks!
import tkinter as tk
class fruits:
all_fruits = []
def __init__(self,name):
self.flag = 0
self.name = name
fruits.all_fruits.append(self.name)
root = tk.Tk()
#Main window
frame = tk.Frame(root)
frame.pack()
#Fruits selection
selectorlist = tk.Listbox(frame)
selectorlist.pack()
#Fruits creation
apple = fruits('apple')
pear = fruits('pear')
#List creation
for item in fruits.all_fruits:
selectorlist.insert(tk.END, item)
#Effect on click
selectorlist.bind("<Button-1>",lambda *a: print("Flag is 1"))
root.mainloop()

Answer 1

With a few changes it can be done, I tried to add as many comments as I could to help explain why.
import tkinter as tk
class fruits:
def __init__(self, name):
self.flag = 0
self.name = name
def clicked(e):
# Function that gets the selected value, then changes the flag property and prints the flag.
selected = e.widget.get(e.widget.curselection()) # Gets the index of the current selection and retrieves it's value.
all_fruits[selected].flag = 1
print(selected, "changed to", all_fruits[selected].flag)
test() # This is a function call to print the entire dictionary so changes can be seen.
def test():
# Function to print the all_fruits dictionary.
for k,v in all_fruits.items():
print(k, v.flag)
print()
root = tk.Tk()
#Main window
frame = tk.Frame(root)
frame.pack()
#Fruits selection
selectorlist = tk.Listbox(frame)
selectorlist.pack()
#Fruits creation
names = ['apple', 'pear', 'grape', 'orange', 'pineapple'] # List of fruit names.
all_fruits = {} # Define a dictionary for all fruits.
for name in names:
# Add each name as a dictionary key with the class as its value.
all_fruits[name] = fruits(name)
#List creation
for item in all_fruits:
# Insert each dictionary key into the listbox
selectorlist.insert(tk.END, item)
#Effect on click
selectorlist.bind("<<ListboxSelect>>", clicked) # Changed this to call a function
root.mainloop()
To implement Add/Remove functions it would almost be better to restructure the class so that there is a separate class managing the all of the fruits.
I added some functions for add/remove that could be helpful later:
import tkinter as tk
class fruit:
"""A Class for each fruit."""
def __init__(self, name):
self.flag = 0
self.name = name
def change(self, value):
self.flag = value
class fruits:
"""A Class for all the fruits."""
def __init__(self):
self.all_fruits = {}
def add(self, listbox, name):
self.all_fruits[name] = fruit(name)
listbox.insert(tk.END, name)
print("Added", name)
def remove(self, listbox, name):
indx = listbox.get(0, tk.END).index(name)
listbox.delete(indx)
del self.all_fruits[name]
print("Deleted", name)
def change(self, name, value):
self.all_fruits[name].change(value)
def clicked(e):
# Function that gets the selected value, then changes the flag property and prints the flag.
selected = e.widget.get(e.widget.curselection()) # Gets the index of the current selection and retrieves it's value.
Fruits.change(selected, 1)
print(selected, "changed to 1")
test() # This is a function call to print the entire dictionary so changes can be seen.
def test():
# Function to print the all_fruits dictionary.
for k,v in Fruits.all_fruits.items():
print(k, v.flag)
print()
root = tk.Tk()
#Main window
frame = tk.Frame(root)
frame.pack()
#Fruits selection
selectorlist = tk.Listbox(frame)
selectorlist.pack()
#Fruits creation
names = ['apple', 'pear', 'grape', 'orange', 'pineapple', 'carrot'] # List of fruit names.
Fruits = fruits() # Creates an instance of fruits
for name in names:
Fruits.add(selectorlist, name) # Add each name with the class's add function.
Fruits.remove(selectorlist, "carrot")
#Effect on click
selectorlist.bind("<<ListboxSelect>>", clicked) # Changed this to call a function
root.mainloop()