Please check my code for errors

Question

An error of patients_management not defined is showing up
This python file is linked with mysql where i have already made the tables of patients, doctors, billing(without any entries)
So why do you think it is not accessing MySQL or should I make the full program after that run the test for error as this not the full code
#python code
import mysql.connector
mydb=mysql.connector.connect(
host='localhost',
user='root',
password='12345',
database='hospital')
mycursor=mydb.cursor()

#main menu
def Main_menu():
while True:
print("\t________________________________________________________")
print("\*******WELCOME TO HOSPITAL MANAGEMENT SYSTEM *")
print("\t________________________________________________________")
print("\n\t***** MAIN MENU *****")
print("1: patients management Menu")
print("2: Doctor Management Menu ")
print("3: Billing Management Menu")
print("4:Exit")
print("\t___________________________________________________________")
choice=int(input("Enter Your Choice:"))
if choice==1:
patients_management()
elif choice==2:
doctor_Management()
elif choice==3:
billing_Management()
elif choice==4:
break
else:
print("ERROR: Invalid Choice Try Again")
con=input("press any key to continue")
Main_menu()

#patient Management Menu
def patients_management():
while True:
print("\t____________________________________________")
print("\t********patient DETAILS********")
print("\t____________________________________________ ")
print("1: Add patient Details")
print("2: Search patient Details")
print("3: View all patient Details")
print("4:Edit patient Details")
print("5: Delete patient Details")
print("6: Return Main Menu")
print("\t_________________________________

Answer 1

move the def patient_management block to before def Main_ menu and see dose it work or not