To do list

Example Python program To-do-list.py

Modules

• import Tkinter
• import tkMessageBox

Methods

• def update_listbox():
• def clear_listbox(): # To clear the previous list otherwise items keeps repeating
• def add_task():
• def del_all():
• def del_one():
• def sort_asc():
• def sort_desc():
• def show_number_of_tasks():

Code

Python tkinter example

#!/usr/bin/python2.7

# Simple To-Do-List GUI in python 2.7
# Dhiraj Saharia
import Tkinter
import tkMessageBox

root = Tkinter.Tk()

#Change root window BG color
root.configure(bg="white")

#Change the title
root.title("My To-Do-List")

#Change the window size
root.geometry("325x275")

#Create empty list
tasks = []
#For testing using a default list
tasks = ["Call Mom", "Buy Bread", "Buy Milk"]




# Create Functions
def update_listbox():
    # Clear the current list
    clear_listbox()
    #Populate the listbox with tasks
    for task in tasks:
        lb_tasks.insert("end", task)

def clear_listbox(): # To clear the previous list otherwise items keeps repeating
    lb_tasks.delete(0, "end")

def add_task():
    # Get the task to add
    task = txt_input.get()
    if task != "":
        # Append to list
        tasks.append(task)
        update_listbox()
    else:
        tkMessageBox.showwarning("WARNING", "You need to enter a task")
    txt_input.delete(0, "end")

def del_all():
    confirmed = tkMessageBox.askyesno("Please Confirm", "Do you really want to delete all tasks?")
    if confirmed == True:
        # Since we are changing the list, it need to be global
        global tasks 
        #Clear the task list
        tasks=[]
        # Update listbox
        update_listbox()

def del_one():
    # Get the text of selected task
    task = lb_tasks.get("active")
    # Confirm in the list
    if task in tasks:
        tasks.remove(task)
    # Update the listbox
    update_listbox()

def sort_asc():
    tasks.sort()
    # Update the listbox
    update_listbox()

def sort_desc():
    tasks.sort()
    tasks.reverse() #Reverse the list for DESC
    update_listbox()

def show_number_of_tasks():
    # Get the number of tasks
    number_of_tasks = len(tasks)
    msg = "Number of Tasks: %s" %number_of_tasks
    # Display the msg in display window
    lbl_display["text"] = msg





lbl_title = Tkinter.Label(root, text="To-Do-List", bg="white") #Create Widget
lbl_title.grid(row=0,column=0) #To have the buttons in a grid

lbl_display = Tkinter.Label(root, text="", bg="white") # To add space after title
lbl_display.grid(row=0,column=1)

txt_input = Tkinter.Entry(root, width=15) #To entry Task
txt_input.grid(row=1,column=1)

# Buttons
btn_add_task = Tkinter.Button(root, text="Add Task", fg="red", bg="white", command=add_task)
btn_add_task.grid(row=1,column=0)

btn_del_all = Tkinter.Button(root, text="Delete All Task", fg="red", bg="white", command=del_all)
btn_del_all.grid(row=2,column=0)

btn_del_one = Tkinter.Button(root, text="Delete One Task", fg="red", bg="white", command=del_one)
btn_del_one.grid(row=3,column=0)

btn_sort_asc = Tkinter.Button(root, text="Sort Task Ascending", fg="green", bg="white", command=sort_asc)
btn_sort_asc.grid(row=4,column=0)

btn_sort_desc = Tkinter.Button(root, text="Sort Task Desending", fg="green", bg="white", command=sort_desc)
btn_sort_desc.grid(row=5,column=0)

btn_number_of_tasks = Tkinter.Button(root, text="Number of Tasks", fg="red", bg="white", command=show_number_of_tasks)
btn_number_of_tasks.grid(row=6,column=0)

btn_exit = Tkinter.Button(root, text="Quit", fg="black", bg="white", command=exit) #Exit command is inbuilt
btn_exit.grid(row=7,column=0)

lb_tasks = Tkinter.Listbox(root)
lb_tasks.grid(row=2,column=1,rowspan=6)


root.mainloop()

Useful Links

• Articles: https://python-commandments.org/
• Python shell: https://bsdnerds.org/learn-python/
• Tutorial: https://pythonprogramminglanguage.com/