Create a day_week_year planner with Python

Creating a day/week/year planner in Python involves designing a program that can organize tasks or events by day, week, and year. Below is a detailed example of a simple command-line planner with the ability to add, view, and save plans for days, weeks, and years using Python.

This example will cover:

• Storing tasks/events by date

• Viewing tasks by day, week, or year

• Saving and loading data to/from a file (JSON format)

python
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import json
from datetime import datetime, timedelta
from collections import defaultdict

class Planner:
    def __init__(self, filename="planner_data.json"):
        self.filename = filename
        self.tasks = defaultdict(list)  # key: 'YYYY-MM-DD', value: list of tasks
        self.load()

    def add_task(self, date_str, task):
        """Add a task to a specific date."""
        try:
            datetime.strptime(date_str, '%Y-%m-%d')  # validate date format
            self.tasks[date_str].append(task)
            print(f"Task added on {date_str}.")
        except ValueError:
            print("Invalid date format. Use YYYY-MM-DD.")

    def view_day(self, date_str):
        """View tasks for a single day."""
        tasks = self.tasks.get(date_str, [])
        print(f"Tasks for {date_str}:")
        if tasks:
            for i, task in enumerate(tasks, 1):
                print(f"  {i}. {task}")
        else:
            print("  No tasks for this day.")

    def view_week(self, start_date_str):
        """View tasks for a week starting from the given date."""
        try:
            start_date = datetime.strptime(start_date_str, '%Y-%m-%d')
            print(f"Tasks for the week starting {start_date_str}:")
            for i in range(7):
                current_date = start_date + timedelta(days=i)
                date_str = current_date.strftime('%Y-%m-%d')
                tasks = self.tasks.get(date_str, [])
                print(f"n{date_str} ({current_date.strftime('%A')}):")
                if tasks:
                    for j, task in enumerate(tasks, 1):
                        print(f"  {j}. {task}")
                else:
                    print("  No tasks.")
        except ValueError:
            print("Invalid date format. Use YYYY-MM-DD.")

    def view_year(self, year):
        """View tasks for the entire year."""
        print(f"Tasks for the year {year}:")
        found = False
        for date_str in sorted(self.tasks.keys()):
            if date_str.startswith(str(year)):
                found = True
                tasks = self.tasks[date_str]
                date_obj = datetime.strptime(date_str, '%Y-%m-%d')
                print(f"n{date_str} ({date_obj.strftime('%A')}):")
                for i, task in enumerate(tasks, 1):
                    print(f"  {i}. {task}")
        if not found:
            print("  No tasks for this year.")

    def save(self):
        """Save tasks to JSON file."""
        with open(self.filename, 'w') as f:
            json.dump(self.tasks, f)
        print("Planner data saved.")

    def load(self):
        """Load tasks from JSON file."""
        try:
            with open(self.filename, 'r') as f:
                data = json.load(f)
                # Convert keys to str and values to list
                self.tasks = defaultdict(list, {str(k): v for k, v in data.items()})
            print("Planner data loaded.")
        except (FileNotFoundError, json.JSONDecodeError):
            print("No saved planner data found. Starting fresh.")

def main():
    planner = Planner()
    
    while True:
        print("nPlanner Menu:")
        print("1. Add Task")
        print("2. View Day")
        print("3. View Week")
        print("4. View Year")
        print("5. Save and Exit")
        
        choice = input("Choose an option (1-5): ").strip()
        
        if choice == '1':
            date_str = input("Enter date (YYYY-MM-DD): ").strip()
            task = input("Enter task description: ").strip()
            planner.add_task(date_str, task)
            
        elif choice == '2':
            date_str = input("Enter date (YYYY-MM-DD): ").strip()
            planner.view_day(date_str)
            
        elif choice == '3':
            start_date_str = input("Enter start date of the week (YYYY-MM-DD): ").strip()
            planner.view_week(start_date_str)
            
        elif choice == '4':
            year_str = input("Enter year (YYYY): ").strip()
            if year_str.isdigit() and len(year_str) == 4:
                planner.view_year(year_str)
            else:
                print("Invalid year format.")
                
        elif choice == '5':
            planner.save()
            print("Goodbye!")
            break
        else:
            print("Invalid choice. Please select 1-5.")

if __name__ == "__main__":
    main()

How this planner works:

• You can add tasks on any date by entering the date in YYYY-MM-DD format.

• You can view tasks for a specific day, week (7 days starting from a given date), or the entire year.

• Tasks are stored in a JSON file (planner_data.json) so they persist across sessions.

• The planner uses defaultdict(list) to store multiple tasks per date.

• The interface is command-line based and simple to extend.

You can run this script in any Python 3 environment. It provides a basic but effective planning tool organized by day, week, and year.