How to ensure that the "bind" order is not skipped in tkinter? - python-3.x

Question

I am trying to create a game using tkinter in which the players enter their names into an entry widget.
After entering their name, the user should press enter to call the function "player_names", which would ideally save the players name in a list, delete the text in the entry widget and then continue to the next loop (i.e player).
The script seems to be ignoring the bind and and moving straight to the line "self.name_entry.destroy()". How do I ensure that the script waits for the command before continuing?
def initialise_game(self, num_of_players):
self.players_list = []
for i in range(num_of_players):
player_num = i+1
self.name_label = tk.Label(self.bg_label, text='What is the name'
' of Player ' + str(player_num) + '?')
self.name_label.grid(row=0, padx=200, pady=120)
self.name_entry = tk.Entry(self.bg_label)
self.name_entry.grid(row=1, padx=200, pady=0)
self.name_entry.bind('<Return>', self.player_names)
self.name_entry.destroy()
def player_names(self, event):
self.players_list.append(self.name_entry.get())
self.name_entry.delete(0, 'end')

Answer 1

Entry doesn't work like input() it will not stop code and wait till you put text and press enter. GUI creates Entry and it executes code after Entry at once. You have bind to assign function which will be executed whey you press Enter and this function should get value from Entry, and replace widgets (or only text in Label). It also should remove Entry after last player so you have to count how many times function was executed (or how many players you already have - self.player_num)
I didn't test this code but it should works.
def initialise_game(self, num_of_players):
self.players_list = []
# remeber values in class variables, not local one
self.num_of_players = num_of_players
self.player_num = 0
# create only one Label - and change text in it
self.name_label = tk.Label(self.bg_label,
self.name_label.grid(row=0, padx=200, pady=120)
# create only one Entry and assign function `self.player_names`
self.name_entry = tk.Entry(self.bg_label)
self.name_entry.grid(row=1, padx=200, pady=0)
self.name_entry.bind('<Return>', self.player_names)
# set text for first player
self.player_num += 1
self.name_label["text"] = 'What is the name of Player {} ?'.format(player_num)
def player_names(self, event):
# get player's name from Entry
self.players_list.append(self.name_entry.get())
self.name_entry.delete(0, 'end')
# set text for next player or destroy Entry after last player
self.player_num += 1
if self.player_num <= self.num_of_players:
self.name_label["text"] = 'What is the name of Player {} ?'.format(player_num)
else:
self.name_label.destroy()
self.name_entry.destroy()
The same way it works in other GUIs (not only in tkinter) and other languages (not only in Python)

Answer 2

My idea of what are you trying to acomplish shuld be the same, to take an input from the player one by one until all player have added a name.
The ploblem with your code is the for, it needs to complite without an input from the player (tecnicly), insted i opted for the update mecanics that tkinter have, wen a value changes in a winget the winget will update itself and i bind to the button a change value from a increment.
If you want to reuse i , reference it a the start of the def the same wey
This example works, the input of initialise_game is the same as before, replacing the conde in the middle will work just fine, except if your code uses .grid() then replace ask_name.pack()
import tkinter as tk
root = tk.Tk()
root.bg_label = tk.Frame(root)
# Added code, top and bottom are for testing
#--------------------------------------------------------------------------------
root.players_list = [] # Global variabe witch can be accesd by all funcions
i = 1 # This global value is to keep a clear reference on the count of windows
def initialise_game(self, num_of_players):
ask_name = tk.Frame(self)
L = tk.Label(ask_name, text=('What is the name of Player ' + str(i) + '?'))
L.grid(row=0, padx=200, pady=120)
E = tk.Entry(ask_name)
def modify_entry(NULL):
root.players_list.append(E.get())
E.delete(0, 'end')
global i # Change the "search" of values to outside the funtion
i += 1
L.config(text=('What is the name of Player ' + str(i) + '?'))
if (i > num_of_players): # Close the Frame wen all were answered
root.players_list.append(E.get())
ask_name.destroy()
E.bind('<Return>', modify_entry)
E.grid(row=1, padx=200, pady=0)
ask_name.pack() # You can replace it with grin , this moves the Label + Entry were u want
#--------------------------------------------------------------------------------
initialise_game(root.bg_label, 3)
root.bg_label.pack()
root.mainloop()