Hi All,

In this tutorial we will update list as user enter an entry to the list. We create an entry field and a button to get details from the user and label to show the list. First we will create a user interface.

1) First step is to create a non resizable window 600X400 :-

#!/usr/bin/python

import sys
if sys.version_info < (3, 0):
    # Python 2
    import Tkinter as tk
    from Tkinter import *
else:
    # Python 3
    import tkinter as tk
    from Tkinter import *

root = tk.Tk()
root.title("Mac Application")
root.resizable(width=False, height=False)
root.geometry('600x400')
obj = ListExample()
tk.mainloop()

2) Now create user interface for app : We added a label , textfield and a button , to create UI we used tkinter library of python.

#!/usr/bin/python

import sys
if sys.version_info < (3, 0):
    # Python 2
    import Tkinter as tk
    from Tkinter import *
else:
    # Python 3
    import tkinter as tk
    from Tkinter import *
class ListExample:

   def __init__(self):
      parent = tk.Frame(root)
      parent.grid()
      self.v = StringVar()
      self.v.set('') 
      self.e2 = tk.Entry(parent , bd = 2,textvariable=self.v)
      self.e2.grid(row=0, column=0)
      self.e2.pack(side="left",fill="x", expand=True)
      self.btn = tk.Button(parent, text="Add Player")
      self.btn.grid(row=0, column=1)
      self.btn.pack(side="right",fill="x", expand=True)
      parent.pack(expand=0)
      self.lbl = tk.Label( root , bd=2 , text="")
      self.lbl.pack()
      self.lbl1 = tk.Label( root , bd=2 , text="Players :- ")
      self.lbl1.pack()
      self.mylist = []
      self.lbl2 = tk.Label( root, bd=2 , text="")
      self.lbl2.pack()

root = tk.Tk()
root.title("Mac Application")
root.resizable(width=False, height=False)
root.geometry('600x400')
obj = ListExample()
tk.mainloop()

3) Now add action to button and show the status of user action below :-

#!/usr/bin/python

import sys
if sys.version_info < (3, 0):
    # Python 2
    import Tkinter as tk
    from Tkinter import *
else:
    # Python 3
    import tkinter as tk
    from Tkinter import *

class ListExample:

   def __init__(self):
      parent = tk.Frame(root)
      parent.grid()
      self.v = StringVar()
      self.v.set('') 
      self.e2 = tk.Entry(parent , bd = 2,textvariable=self.v)
      self.e2.grid(row=0, column=0)
      self.e2.pack(side="left",fill="x", expand=True)
      self.btn = tk.Button(parent, text="Add Player",command=self.addPlayer)
      self.btn.grid(row=0, column=1)
      self.btn.pack(side="right",fill="x", expand=True)
      parent.pack(expand=0)
      self.lbl = tk.Label( root , bd=2 , text="")
      self.lbl.pack()
      self.lbl1 = tk.Label( root , bd=2 , text="Players :- ")
      self.lbl1.pack()
      self.mylist = []
      self.lbl2 = tk.Label( root, bd=2 , text="")
      self.lbl2.pack()

   def addPlayer(self):

   	  if len(self.e2.get()) == 0 or (len(self.e2.get().strip()) == 0) :
   	  	self.lbl.config(text='Please enter valid player name!!')
   	  	return
   	  else:
   	  	self.lbl.config(text='')
   	  self.mylist.append(self.e2.get())
   	  self.lbl2.config(text='\n'.join(map(str, self.mylist)))
   	  self.v.set('')
   	  




root = tk.Tk()
root.title("Mac Application")
root.resizable(width=False, height=False)
root.geometry('600x400')
obj = ListExample()
tk.mainloop()

Now you can run this app from your command line and just enter players name and players list will be automatic updated.