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import json
import datetime
class Calendar:
def __init__(self, filename="calendar_data.json"):
self.filename = filename
self.reminders = self.load_calendar()
self.current_date = datetime.date.today()
def load_calendar(self):
"""Load reminders from a file."""
try:
with open(self.filename, "r") as file:
return json.load(file)
except (FileNotFoundError, json.JSONDecodeError):
return {}
def save_calendar(self):
"""Save reminders to a file."""
with open(self.filename, "w") as file:
json.dump(self.reminders, file, indent=4)
def add_reminder(self, date, reminder):
"""Add a reminder for a specific date."""
if date not in self.reminders:
self.reminders[date] = []
self.reminders[date].append(reminder)
self.save_calendar()
print(f"Reminder added for {date}: {reminder}")
def show_all_reminders(self):
"""Show all past and future reminders in our calendar app"""
if (self.reminders is None) or len(self.reminders)<1:
print("No reminders in calendar app. Please create an event reminder to start using the app.")
else:
print("# Date Event Description")
for i,(dt,event_description) in enumerate(self.reminders.items()):
print(f"{i+1}. {dt} {event_description}")
def show_future_reminders(self):
"""Show all future reminders in our calendar app"""
if (self.reminders is None) or len(self.reminders)<1:
print("No future reminders in calendar app. Please create a future event reminder.")
else:
current_datetime = datetime.datetime.now()
print("# Date Event Description")
for i,(dt,event_description) in enumerate(self.reminders.items()):
dt = datetime.datetime.strptime(dt, '%Y-%m-%d')
if current_datetime.date() <= dt.date():
print(f"{i+1}. {dt} {event_description}")
def show_reminders(self, date):
"""Show reminders for a specific date."""
if date in self.reminders:
print(f"Reminders for {date}:")
for i, reminder in enumerate(self.reminders[date], 1):
print(f"{i}. {reminder}")
else:
print(f"No reminders for {date}.")
def browse_calendar(self, days):
"""Move forward or backward in the calendar by a given number of days."""
self.current_date += datetime.timedelta(days=days)
print(f"Current date: {self.current_date}")
self.show_reminders(str(self.current_date))
if __name__ == "__main__":
calendar = Calendar()
while True:
print("\nCalendar Menu:")
print("1. Add Reminder")
print("2. Show All Past and Future Reminders")
print("3. Show All Future Reminders")
print("4. Show Reminders for Specific Day")
print("5. Browse Calendar")
print("6. Exit")
choice = input("Choose an option: ")
if choice == "1":
date = input("Enter date (YYYY-MM-DD): ")
reminder = input("Enter description for event reminder: ")
calendar.add_reminder(date, reminder)
elif choice == "2":
calendar.show_all_reminders()
elif choice == "3":
calendar.show_future_reminders()
elif choice == "4":
date = input("Enter date (YYYY-MM-DD): ")
calendar.show_reminders(date)
elif choice == "5":
days = int(input("Enter number of days to move (positive for forward, negative for backward): "))
calendar.browse_calendar(days)
elif choice == "6":
calendar.save_calendar()
break
else:
print("Invalid option. Please try again.")
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