Amazing-Python-Scripts

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# Check for the existence of file
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no_of_items = 0
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try:
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    f = open("./TODO (CLI-VER)/todolist.txt")
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    p = 0
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    for i in f.readlines():  # Counting the number of items if the file exists already
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        p += 1
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    no_of_items = p-2
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except:
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    f = open("./TODO (CLI-VER)/todolist.txt", 'w')
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    f.write("_________TODO LIST__________\n")
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    f.write("    TIME                   WORK")
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finally:
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    f.close()
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# Todo list
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print("Press 1: Add Item \nPress 2: Delete Item \nPress 3: Update item \nPress 4: Display Items\nPress 5: Exit")
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n = int(input())
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while n == 1 or n == 2 or n == 3 or n == 4:
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    if n == 1:
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        todo = []
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        print("Enter the time in HH:MM format(24 hours format)")
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        time = input()
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        print("Enter your Work")
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        work = input()
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        no_of_items += 1
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        with open('./TODO (CLI-VER)/todolist.txt', 'a') as f:
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            f.write("\n"+str(no_of_items)+"    " +
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                    time+"                   "+work)
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    elif n == 2:
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        if (no_of_items <= 0):
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            print("There is no item in the list kindly add some items")
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        else:
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            print("____________________________________________________________")
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            print("Your Current List: ")
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            todo = []
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            with open('./TODO (CLI-VER)/todolist.txt') as f:
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                for i in f.readlines():
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                    print(i)
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                    todo.append(i)
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            print("____________________________________________________________")
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            print("Enter the position of the item you want to delete : ")
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            pos = int(input())
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            if (pos <= 0):
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                print("Please enter a valid position")
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            elif (pos > (no_of_items)):
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                print("Please enter the position <= {}".format(no_of_items))
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            else:
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                todo.pop(pos+1)
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                no_of_items -= 1
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                if (no_of_items <= 0):
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                    print("Congratulations your todo list is empty!")
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                with open('./TODO (CLI-VER)/todolist.txt', 'w') as f:
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                    for i in range(len(todo)):
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                        if i >= (pos+1):
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                            f.write(str(pos)+todo[i][1:])
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                            pos += 1
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                        else:
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                            f.write(todo[i])
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    elif n == 3:
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        print("____________________________________________________________")
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        print("Your Current List: ")
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        todo = []
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        with open('./TODO (CLI-VER)/todolist.txt') as f:
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            for i in f.readlines():
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                print(i)
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                todo.append(i)
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        print("____________________________________________________________")
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        print("Enter the position of the items you want to update : ")
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        pos = int(input())
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        if (pos <= 0):
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            print("Please enter a valid position")
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        elif (pos > (no_of_items)):
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            print("Please enter the position <= {}".format(no_of_items))
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        else:
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            print("What you want to update : ")
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            print("Press 1: Time\nPress 2: Work")
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            choice = int(input())
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            if choice == 1:
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                print("Enter your updated time :")
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                time = input()
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                p = todo[pos+1].index(":")
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                y = 0
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                with open('./TODO (CLI-VER)/todolist.txt', 'w') as f:
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                    for i in range(len(todo)):
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                        if i == pos+1:
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                            f.write(str(pos)+"    "+time+"" +
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                                    ''.join(todo[pos+1][p+3:]))
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                        else:
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                            f.write(todo[i])
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            elif choice == 2:
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                print("Enter your updated work :")
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                work = input()
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                p = todo[pos+1].index(":")
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                y = 0
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                with open('./TODO (CLI-VER)/todolist.txt', 'w') as f:
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                    for i in range(len(todo)):
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                        if i == pos+1:
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                            f.write(
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                                str(pos)+"    "+''.join(todo[pos+1][p-2:p+3])+"                   "+work)
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                        else:
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                            f.write(todo[i])
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    elif n == 4:
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        print("Your Current List: ")
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        todo = []
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        print("____________________________________________________________")
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        with open('./TODO (CLI-VER)/todolist.txt') as f:
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            for i in f.readlines():
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                print(i)
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                todo.append(i)
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        print("____________________________________________________________")
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    print("Press 1: Add Item \nPress 2: Delete the Item\nPress 3: Update item\nPress 4:Display Items\nPress 5:Exit")
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    n = int(input())
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print("Thank you for using our application")
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