#!/usr/bin/env python

# Author: OMKAR PATHAK

# This is a small fun project which I have developed to get through all the concepts learned so far.

# For installing on Ubuntu:

# sudo apt install python3-tk 

from tkinter import *

from tkinter.messagebox import showerror

import pickle

class todoGUI(object):

def __init__(self):

self.mainWindow = Tk()

self.mainWindow.title('TODO Application!')

self.fieldnames = ('key', 'name', 'age', 'pay')

def buildWidgets(self):

global entries

entries = {}

self.mainFrame = Frame(self.mainWindow)

self.mainFrame.pack()

for(idx, label) in enumerate(self.fieldnames):

labels = Label(self.mainFrame, text = label)

ent = Entry(self.mainFrame, font=('Arial', 17))

# ent.pack()

labels.grid(row = idx, column = 0)

ent.grid(row = idx, column = 1)

entries[label] = ent

Button(self.mainWindow, text="Fetch", command = self.fetchRecord).pack(side=LEFT)

Button(self.mainWindow, text="Update", command = self.updateRecord).pack(side=LEFT)

Button(self.mainWindow, text="Quit", command = self.mainWindow.quit).pack(side=RIGHT)

return entries

def fetchRecord(self):

dbfile = open('examplePickle', 'rb')

db = pickle.load(dbfile)

try:

key = entries['key'].get()

record = db[key]

# fetch by key, show in GUI

except:

showerror(title='Error', message='No such key!')

else:

for field in self.fieldnames:

entries[field].delete(0, END)

entries[field].insert(0, record[field])

dbfile.close()

return record

def updateRecord(self):

dbfile = open('examplePickle', 'rb')

db = pickle.load(dbfile)

dbfile.close()

key = entries['key'].get()

if key in db:

record = db[key]

# update existing record

else:

# make/store new one for key

# db['name'] = entries['name'].get()

# db[str(key)] = key

dbfile = open('examplePickle', 'ab')

temp = {}

# temp['key'] = str(key)

# for field in self.fieldnames[1:]:

# temp[field] = str(entries[field].get())

#

# print(temp)

# db[str(key)] = temp

# print(db)

del db[key]

for field in self.fieldnames:

temp[field] = entries[field].get()

pickle.dump(temp, dbfile)

dbfile.close()

def startGUI(self):

self.mainWindow.mainloop()

if __name__ == '__main__':

window = todoGUI()

entries = window.buildWidgets()

window.startGUI()