Build a customizable daily planner in Python

Creating a customizable daily planner in Python can be a fun and practical project. Below is a complete example of a console-based daily planner that lets users add, view, edit, and delete tasks for each day. It supports customization of task categories, priority levels, and saving/loading data from a JSON file for persistence.

python
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import json
from datetime import datetime

class Task:
    def __init__(self, description, category="General", priority="Medium", completed=False):
        self.description = description
        self.category = category
        self.priority = priority
        self.completed = completed

    def to_dict(self):
        return {
            "description": self.description,
            "category": self.category,
            "priority": self.priority,
            "completed": self.completed
        }

    @staticmethod
    def from_dict(data):
        return Task(
            description=data["description"],
            category=data.get("category", "General"),
            priority=data.get("priority", "Medium"),
            completed=data.get("completed", False)
        )

class DailyPlanner:
    def __init__(self, filename="planner_data.json"):
        self.tasks = {}  # {date_str: [Task, Task, ...]}
        self.filename = filename
        self.load()

    def add_task(self, date, task):
        if date not in self.tasks:
            self.tasks[date] = []
        self.tasks[date].append(task)
        print(f"Task added for {date}.")

    def view_tasks(self, date):
        if date not in self.tasks or not self.tasks[date]:
            print(f"No tasks scheduled for {date}.")
            return
        print(f"Tasks for {date}:")
        for idx, task in enumerate(self.tasks[date], start=1):
            status = "✓" if task.completed else "✗"
            print(f"{idx}. [{status}] {task.description} | Category: {task.category} | Priority: {task.priority}")

    def edit_task(self, date, task_index):
        if date not in self.tasks or task_index < 1 or task_index > len(self.tasks[date]):
            print("Invalid task number.")
            return
        task = self.tasks[date][task_index - 1]
        print("Editing task:")
        print(f"Current description: {task.description}")
        new_desc = input("Enter new description (or press Enter to keep): ")
        if new_desc.strip():
            task.description = new_desc.strip()

        print(f"Current category: {task.category}")
        new_cat = input("Enter new category (or press Enter to keep): ")
        if new_cat.strip():
            task.category = new_cat.strip()

        print(f"Current priority: {task.priority}")
        new_prio = input("Enter new priority (Low/Medium/High) (or press Enter to keep): ")
        if new_prio.strip() and new_prio.strip().capitalize() in ["Low", "Medium", "High"]:
            task.priority = new_prio.strip().capitalize()

        print(f"Current status: {'Completed' if task.completed else 'Not Completed'}")
        new_comp = input("Mark as completed? (y/n) (or press Enter to keep): ").lower()
        if new_comp == "y":
            task.completed = True
        elif new_comp == "n":
            task.completed = False

        print("Task updated.")

    def delete_task(self, date, task_index):
        if date not in self.tasks or task_index < 1 or task_index > len(self.tasks[date]):
            print("Invalid task number.")
            return
        removed_task = self.tasks[date].pop(task_index - 1)
        print(f"Removed task: {removed_task.description}")

    def save(self):
        data = {date: [task.to_dict() for task in tasks] for date, tasks in self.tasks.items()}
        with open(self.filename, "w") as f:
            json.dump(data, f, indent=4)
        print("Planner saved.")

    def load(self):
        try:
            with open(self.filename, "r") as f:
                data = json.load(f)
            self.tasks = {date: [Task.from_dict(task) for task in tasks] for date, tasks in data.items()}
            print("Planner loaded.")
        except FileNotFoundError:
            self.tasks = {}

def main():
    planner = DailyPlanner()

    while True:
        print("n--- Daily Planner ---")
        print("1. Add task")
        print("2. View tasks")
        print("3. Edit task")
        print("4. Delete task")
        print("5. Save and Exit")
        choice = input("Select an option (1-5): ").strip()

        if choice == "1":
            date = input("Enter date (YYYY-MM-DD): ").strip()
            try:
                datetime.strptime(date, "%Y-%m-%d")
            except ValueError:
                print("Invalid date format.")
                continue
            description = input("Task description: ").strip()
            category = input("Category (default: General): ").strip() or "General"
            priority = input("Priority (Low/Medium/High, default: Medium): ").strip().capitalize() or "Medium"
            if priority not in ["Low", "Medium", "High"]:
                priority = "Medium"
            task = Task(description, category, priority)
            planner.add_task(date, task)

        elif choice == "2":
            date = input("Enter date to view tasks (YYYY-MM-DD): ").strip()
            planner.view_tasks(date)

        elif choice == "3":
            date = input("Enter date of task to edit (YYYY-MM-DD): ").strip()
            planner.view_tasks(date)
            try:
                task_num = int(input("Enter task number to edit: ").strip())
            except ValueError:
                print("Invalid input.")
                continue
            planner.edit_task(date, task_num)

        elif choice == "4":
            date = input("Enter date of task to delete (YYYY-MM-DD): ").strip()
            planner.view_tasks(date)
            try:
                task_num = int(input("Enter task number to delete: ").strip())
            except ValueError:
                print("Invalid input.")
                continue
            planner.delete_task(date, task_num)

        elif choice == "5":
            planner.save()
            print("Goodbye!")
            break

        else:
            print("Invalid choice. Please enter a number between 1 and 5.")

if __name__ == "__main__":
    main()

Features:

• Add tasks with description, category, and priority.

• View all tasks for a specific date.

• Edit existing tasks including their completion status.

• Delete tasks.

• Save all tasks to a JSON file (planner_data.json) and load them automatically on startup.

• Date input is expected in YYYY-MM-DD format.

• Basic input validation and user prompts.

You can extend this planner by adding features like reminders, recurring tasks, or a GUI interface if desired.