CPT 200: Functionality 3 - Loops and Functions

import sys
employeeList = {}
lstMenuOption = ('1', '2', '3', 'Q')
#i = 0 #loop count variable
validation = False #initialize validation check to "False"
menuSelection = None
numEmployees = None
num = 1

def main_menu():
    print('-----------------------------------------------------')
    print('(1) Add new employee(s)')
    print('(2) View all employees in the database')
    print("(3) Check employee's information")
    print('(Q) Exit\n')
    totalEmployees = len(employeeList) #Display number of employees in the databse
    print('There are (%d) in the database' % totalEmployees)
    print('-----------------------------------------------------')
    option = input('Please select an option from the menu: ')
    return option

def valid(option): #Function to validate menu selection
    if (option.isnumeric() == True):
        if option in lstMenuOption:
            return True
    elif (option.upper() == 'Q'):
        global menuSelection
        menuSelection = option.upper()
        return True
    elif (option.isnumeric() == False):
        print('You have not entered a correct option.')
        return False
   
def num_employees():
    numEmployees = (input('Please enter the number of employee(s) you are entering (Q to Quit): '))
    if (numEmployees.isnumeric() == True) and (int(numEmployees) < 0):
        print('You have entered an invalid quantity\n')
    elif (numEmployees.isnumeric() == False):
        if (numEmployees.upper() == 'Q'):
            exit()
        else:
            print('You have entered an invalid quantity')
            return None
    else:
        numEmployees = int(numEmployees)
        return numEmployees
   
#while (numEmployees > 0):
def add_employee(): #CPT 200: Functionality 1 part 1
        employeeFName = input("Please Emter the Employee #%d's First Name:" % num)
        employeeLName = input("Please Enter the Employee #%d's Last Name:" % num)
        employeeSSN = input("Please Enter %s %s's SSN (123456789):" % (employeeFName, employeeLName))
        employeePhone = input("Please Enter %s %s's Phone Number:" % (employeeFName, employeeLName))
        employeeEmail = input("Please Enter %s %s's Email Address:" % (employeeFName, employeeLName))
        employeeSalary = input("Please Enter %s %s's Salary:" % (employeeFName, employeeLName))
        employeeFull = employeeFName + ' ' + employeeLName
        print(" ")
        employeeInfo = [employeeFName.capitalize(), employeeLName.capitalize(), employeeSSN, employeePhone, employeeEmail, employeeSalary]
        #employeeList[employeeLName] = employeeInfo
        return employeeFull.upper(), employeeInfo

def view_all_employees(): #Function to display all the keys of employeeList, Functionality 1 part 2
    print('-----------------------------------------------------')
    print('The following employees are currently in the database')
    for key in employeeList.keys():
        print(key)
    print('-----------------------------------------------------')
   
def view_employee(): #Funtionality 1 part 2.5
    print('-----------------------------------------------------')
    empName = input('Please enter the name of the employee you want to view: ').upper()
    if empName in employeeList:
        record = employeeList[empName]
        print('The employee record for %s is below' % empName)
        print('First Name: %s' % record[0])
        print('Last Name: %s' % record[1])
        print('Employee SSN: %s' % record[2])
        print('Employee Phone: %s' % record[3])
        print('Employee Email: %s' % record[4])
        print('Employee Salary: %s' % record[5])
    else:
        print('-----------------------------------------------------')
        print('''That name is not in the database''')
        print('-----------------------------------------------------')
        main_menu()

while menuSelection == None:
    while validation == False: #Menu option validation
        menuSelection = main_menu()
        validation = valid(menuSelection)

    if menuSelection in lstMenuOption: #Menu option selection
        while (menuSelection.isnumeric() == True):
            if menuSelection == '1':
                while numEmployees == None or numEmployees == 0:
                    numEmployees = num_employees()
               
                for employee in range(0, numEmployees, 1):
                    employeeFull, employeeInfo = add_employee()
                    employeeList[employeeFull] = employeeInfo
                    numEmployees = numEmployees - 1
                    num = num + 1
                    if (numEmployees > 0):
                        print('Prepare to enter employee #%d' % num)
                menuSelection = None #Reset check values to default
                validation = False
                break
            if menuSelection == '2':
                view_all_employees()
                menuSelection = None #Reset check values to default
                validation = False
                break
            if menuSelection == '3':
                view_employee()
                menuSelection = None
                validation = False
            break
        else: #(menuSelection.isnumeric() == False):
            if menuSelection == 'Q':
                exit()
    else:
        print('You have not selected a valid option. Please try again.')
        menuSelection = None
        validation = False
       
    #view_all_employees()
    #menuSelection = main_menu()

#empSelection = input("Please enter the employee's last name to display their info or enter 'q' to quit: ")

#if empSelection.upper() == 'Q':
#    sys.exit
#else:
#    if (0 < int(empSelection) < num):
#        print(employeeList[empSelection])