import tkinter as tk
from tkinter import ttk
import datetime

month=(datetime.date.today()).strftime("%B") # get current MONTH

window=tk.Tk()
window.title(month) # title is current MONTH
content=tk.StringVar()
reminder=[]  #  button list
item=[]  #  list of input from entry
cOntent=content.get()
count=0
style=ttk.Style()
style.theme_use('default')
style.configure('styled.TButton',foreground='blue',background='yellow')
style.map('styled.TButton',
    foreground=[('pressed','red'),('focus','green'),('disabled','yellow')],
    background=[('active','yellow'),('disabled','blue')])

reminderEntry=ttk.Entry(window, textvariable=content)
reminderEntry.grid(row=0,column=0)

def clear_entry():
    reminderEntry.delete(0,'end')
def add():
    global content
    cOntent=content.get()
    global count
    reminder.append(ttk.Button(window,text=cOntent,command=lambda :done(),
        style='styled.TButton'))

    def done():
        for i in range(len(cOntent)):
            reminder[i].configure(text=reminder[i]['text']+" DONE",
            state='disabled')
            print((reminder[i]).configure())

    reminder[-1].grid(row=count+2,column=0,sticky='nsew')
    count += 1
    clear_entry()



add=tk.Button(window,text='Add',command=add)
add.grid(row=1,column=0)
print(window.grid_slaves(),cOntent)
window.mainloop()