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todo.py
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todo.py
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import json
import os
TODO_FILE = "todos.json"
def load_todos():
if os.path.exists(TODO_FILE):
with open(TODO_FILE, "r") as f:
return json.load(f)
return []
def save_todos(todos):
with open(TODO_FILE, "w") as f:
json.dump(todos, f)
def add_todo(todos, task):
todos.append({"task": task, "completed": False})
save_todos(todos)
print(f"Added task: {task}")
def list_todos(todos):
if not todos:
print("No tasks in the list.")
else:
for i, todo in enumerate(todos, 1):
status = "✓" if todo["completed"] else " "
print(f"{i}. [{status}] {todo['task']}")
def complete_todo(todos, index):
if 1 <= index <= len(todos):
todos[index - 1]["completed"] = True
save_todos(todos)
print(f"Marked task {index} as completed.")
else:
print("Invalid task number.")
def main():
todos = load_todos()
while True:
print("\n--- Todo List ---")
print("1. Add task")
print("2. List tasks")
print("3. Mark task as completed")
print("4. Quit")
choice = input("Enter your choice (1-4): ")
if choice == "1":
task = input("Enter the task: ")
add_todo(todos, task)
elif choice == "2":
list_todos(todos)
elif choice == "3":
list_todos(todos)
index = int(input("Enter the task number to mark as completed: "))
complete_todo(todos, index)
elif choice == "4":
print("Goodbye!")
break
else:
print("Invalid choice. Please try again.")
if __name__ == "__main__":
main()
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Simple Todo List Application