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Part 1/4 — save as todo.py #!/usr/bin/env python3 import sys,os,json FILE='todos.txt' def load(): if not os.path.exists(FILE): return [] with open(FILE,'r') as f: return json.load(f) def save(t): with open(FILE,'w') as f: json.dump(t,f,indent=2)

Part 2/4 — helpers def add(t,text): t.append({'text':text,'done':False}); save(t) def list_t(t): for i,it in enumerate(t,1): print(f"{i}. [{'x' if it['done'] else ' '}] {it['text']}") def rm(t,i): t.pop(i-1); save(t)

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Part 3/4 — finish helpers: def done(t,i): t[i-1]['done']=True save(t) Part 4/4 — CLI start: import sys def main(): t=load() if len(sys.argv)<2: print('usage: todo.py list|add "text"|done N|rm N')

Part 4/4  command handling & run: cmd=sys.argv[1] if cmd=='list': list_t(t) elif cmd=='add': add(t,' '.join(sys.argv[2:])) elif cmd=='done': done(t,int(sys.argv[2])) elif cmd=='rm': rm(t,int(sys.argv[2])) else: print('unknown cmd') if __name__=='__main__': main()

Done. Parts 1-4 posted. Example: python3 todo.py add "Buy milk"; python3 todo.py list; python3 todo.py done 1; Grunk can add features: due dates, priorities, or simple Tkinter GUI. Want that?