Store and Retrieve data in text files in Python

import datetime

while input:

    print("Welcome to Health Management System")

    print("Note: For correct operations, you must enter the keys as suggested.")

    person = input("Whome? Enter 'hy' for harry, 'rn' rohan, 'hd' for hammad: ")

    rl = input("Enter 'r' for retrieve, 'l' for lock: ")

    en = input("Enter 'e' for exercise, 'n' for nutrition: ")

    # retrieves files

    def retrieve_harry_exercise():

        with open("harry_e.txt") as f:

            harry_exercise = f.read()

            print(harry_exercise)

           

    def retrieve_rohan_exercise():

        with open("rohan_e.txt") as f:

            rohan_exercise = f.read()

            print(rohan_exercise)

           

    def retrieve_hammad_exercise():

        with open("hammad_e.txt") as f:

            hammad_exercise = f.read()

            print(hammad_exercise)

           

    def retrieve_harry_nutrition():      

        with open("harry_n.txt") as f:

            harry_nutrition = f.read()

            print(harry_nutrition)

           

    def retrieve_rohan_nutrition():

        with open("rohan_n.txt") as f:

            rohan_nutrition = f.read()

            print(rohan_nutrition)

           

    def retrieve_hammad_nutrition():

        with open("hammad_n.txt") as f:

            hammad_nutrition = f.read()

            print(hammad_nutrition)  

   

    # write into files directly from the console        

    def lock_harry_exercise():

        with open("harry_e.txt", "a") as f:

            f.write(f"\n{datetime.datetime.now()}\n")

            f.write(input())

           

           

    def lock_rohan_exercise():        

        with open("rohan_e.txt", "a") as f:

            f.write(f"\n{datetime.datetime.now()}\n")

            f.write(input())

           

    def lock_hammad_exercise():

        with open("hammad_e.txt", "a") as f:

            f.write(f"\n{datetime.datetime.now()}\n")

            f.write(input())

           

    def lock_harry_nutrition():        

        with open("harry_n.txt", "a") as f:

            f.write(f"\n{datetime.datetime.now()}\n")

            f.write(input())

           

    def lock_rohan_nutrition():

        with open("rohan_n.txt", "a") as f:

            f.write(f"\n{datetime.datetime.now()}\n")

            f.write(input())

           

    def lock_hammad_nutrition():

        with open("hammad_n.txt", "a") as f:

            f.write(f"\n{datetime.datetime.now()}\n")

            f.write(input())

    if person=="hy":

        if rl=="r":

            if en=="e":

                retrieve_harry_exercise()

            elif en=="n":

                retrieve_harry_nutrition()

        elif rl=="l":

            if en=="e":

                lock_harry_exercise()

            elif en=="n":

                lock_harry_nutrition()

    elif person=="rn":

        if rl=="r":

            if en=="e":

                retrieve_rohan_exercise()

            elif en=="n":

                retrieve_rohan_nutrition()

        elif rl=="l":

            if en=="e":

                lock_rohan_exercise()

            elif en=="n":

                lock_rohan_nutrition()

    elif person=="hd":

        if rl=="r":

            if en=="e":

                retrieve_hammad_exercise()

            elif en=="n":

                retrieve_hammad_nutrition()

        elif rl=="l":

            if en=="e":

                lock_hammad_exercise()

            elif en=="n":

                lock_hammad_nutrition()

   

    else:

        print("Wrong Input!")