added todo

Mini Project/ToDo-gui-python/todo.py

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+# import all functions from the tkinter 
+from tkinter import *
+
+# import messagebox class from tkinter 
+from tkinter import messagebox 
+
+# global list is declare for storing all the task 
+tasks_list = [] 
+
+# global variable is declare for couting the task 
+counter = 1
+
+# Function for checking input error when 
+# empty input is given in task field 
+def inputError() : 
+
+	# check for enter task field is empty or not 
+	if enterTaskField.get() == "" : 
+
+		# show the error message 
+		messagebox.showerror("Input Error") 
+
+		return 0
+
+	return 1
+
+# Function for clearing the contents 
+# of task number text field 
+def clear_taskNumberField() : 
+
+	# clear the content of task number text field 
+	taskNumberField.delete(0.0, END) 
+
+# Function for clearing the contents 
+# of task entry field 
+def clear_taskField() : 
+
+	# clear the content of task field entry box 
+	enterTaskField.delete(0, END) 
+
+# Function for inserting the contents 
+# from the task entry field to the text area 
+def insertTask(): 
+
+	global counter 
+
+	# check for error 
+	value = inputError() 
+
+	# if error occur then return 
+	if value == 0 : 
+		return
+
+	# get the task string concatenating 
+	# with new line character 
+	content = enterTaskField.get() + "\n"
+
+	# store task in the list 
+	tasks_list.append(content) 
+
+	# insert content of task entry field to the text area 
+	# add task one by one in below one by one 
+	TextArea.insert('end -1 chars', "[ " + str(counter) + " ] " + content) 
+
+	# incremented 
+	counter += 1
+
+	# function calling for deleting the content of task field 
+	clear_taskField() 
+
+# function for deleting the specified task 
+def delete() : 
+
+	global counter 
+
+	# handling the empty task error 
+	if len(tasks_list) == 0 : 
+		messagebox.showerror("No task") 
+		return
+
+	# get the task number, which is required to delete 
+	number = taskNumberField.get(1.0, END) 
+
+	# checking for input error when 
+	# empty input in task number field 
+	if number == "\n" : 
+		messagebox.showerror("input error") 
+		return
+
+	else : 
+		task_no = int(number) 
+
+	# function calling for deleting the 
+	# content of task number field 
+	clear_taskNumberField() 
+
+	# deleted specified task from the list 
+	tasks_list.pop(task_no - 1) 
+
+	# decremented 
+	counter -= 1
+
+	# whole content of text area widget is deleted 
+	TextArea.delete(1.0, END) 
+
+	# rewriting the task after deleting one task at a time 
+	for i in range(len(tasks_list)) : 
+		TextArea.insert('end -1 chars', "[ " + str(i + 1) + " ] " + tasks_list[i]) 
+
+
+# Driver code 
+if __name__ == "__main__" : 
+
+	# create a GUI window 
+	gui = Tk() 
+
+	# set the background colour of GUI window 
+	gui.configure(background = "#94d3f7")
+
+	# set the title of GUI window 
+	gui.title("ToDo App") 
+
+	# set the configuration of GUI window 
+	gui.geometry("250x300") 
+
+	# create a label : Enter Your Task 
+	enterTask = Label(gui, text = "Enter Your Task", background="#94d3f7")
+
+	# create a text entry box 
+	# for typing the task 
+	enterTaskField = Entry(gui, background="#e8e9ed")
+
+	# create a Submit Button and place into the root window 
+	# when user press the button, the command or 
+	# function affiliated to that button is executed 
+	Submit = Button(gui, text = "Submit", fg = "Black", bg = "#fafcfc", command = insertTask)
+
+	# create a text area for the root 
+	# with lunida 13 font 
+	# text area is for writing the content 
+	TextArea = Text(gui, height = 5, width = 25, font = "lucida 13", background="#e8e9ed")
+
+	# create a label : Delete Task Number 
+	taskNumber = Label(gui, text="Delete Task Number", bg = "#94d3f7")
+
+	taskNumberField = Text(gui, height = 1, width = 2, font = "lucida 13", background="#e8e9ed")
+
+	# create a Delete Button and place into the root window 
+	# when user press the button, the command or 
+	# function affiliated to that button is executed . 
+	delete = Button(gui, text = "Delete", fg = "Black", bg = "#fafcfc", command = delete)
+
+	# create a Exit Button and place into the root window 
+	# when user press the button, the command or 
+	# function affiliated to that button is executed . 
+	Exit = Button(gui, text = "Exit", fg = "Black", bg = "#f25f49", command = exit)
+
+	# grid method is used for placing 
+	# the widgets at respective positions 
+	# in table like structure. 
+	enterTask.grid(row = 0, column = 2) 
+
+	# ipadx attributed set the entry box horizontal size			 
+	enterTaskField.grid(row = 1, column = 2, ipadx = 50) 
+
+	Submit.grid(row = 3, column = 2)
+
+	# padx attributed provide x-axis margin 
+	# from the root window to the widget. 
+	TextArea.grid(row = 5, column = 2, padx = 10, sticky = W)
+
+	taskNumber.grid(row = 6, column = 2, pady = 5)
+
+	taskNumberField.grid(row = 7, column = 2)
+
+	# pady attributed provide y-axis 
+	# margin from the widget.				 
+	delete.grid(row = 8, column = 2, pady = 5)
+
+	Exit.grid(row = 9, column = 2)
+
+	# start the GUI 
+	gui.mainloop()