Pandas DataFrame not updating

[HelpMePlease]

I separated this part from my main post as it is a different problem I'm facing regarding the deletion of rows from the DataFrame.

The program is supposed to delete the car's whole row of data if the user inputs it in the deleteOption. I managed to get it to work individually as shown below.

import pandas as pd
carList = [['Toyota Prius', 'MPV', 'Hybrid', '140000'], 
           ['Honda City', 'Saloon', 'Economical', '75000'], 
           ['Subaru Forester', 'SUV', 'Adventure', '140000'], 
           ['Honda Jazz', 'Hatchback', 'Compact', '70000'], 
           ['Tesla Model 3', 'Coupe', 'Electric Vehicle', '120000'], 
           ['Mercedes-Benz', 'Cabriolet', 'Turbo-charged', '250000']] 
df = pd.DataFrame(carList, columns =['Model', 'Type', 'Spec', 'Price'])
print(df)
        
deleteOption=eval(input("Which car do you want to delete?: "))
df.drop(deleteOption)

Output:
            Model       Type              Spec   Price
0     Toyota Prius        MPV            Hybrid  140000
1       Honda City     Saloon        Economical   75000
2  Subaru Forester        SUV         Adventure  140000
3       Honda Jazz  Hatchback           Compact   70000
4    Tesla Model 3      Coupe  Electric Vehicle  120000
5    Mercedes-Benz  Cabriolet     Turbo-charged  250000
Which car do you want to delete?: 1
Model	Type	Spec	Price
0	Toyota Prius	MPV	Hybrid	140000
2	Subaru Forester	SUV	Adventure	140000
3	Honda Jazz	Hatchback	Compact	70000
4	Tesla Model 3	Coupe	Electric Vehicle	120000
5	Mercedes-Benz	Cabriolet	Turbo-charged	250000

However, once I put in into the menu loop it doesn't delete the row at all.

#Display Main Menu
print('*'*100+'\n'+' '*44+'PRACTICAL\n'+' '*44+'MAIN MENU\n'+
    '1. Display List of Cars\n' + 
    '2. Add Car\n' +
    '3. Edit Car\n' +
    '4. Delete Car\n'+
    '\nEnter q to quit program\n'+'*'*100)

#Set an initial value for choice.
userinput = ''

#Start a loop that runs until the user enters the value 'quit' to exit the program.
while userinput != 'q':
    userinput = input("\nWhat would you like to do? ")
    
     #If user chooses 1 to Display Car List
    if userinput == '1':
        print("\nYou have decided to display the list of cars.")
        print("\n")
        #Import pandas as pd 
        import pandas as pd
        carList = [['Toyota Prius', 'MPV', 'Hybrid', '140000'], 
                   ['Honda City', 'Saloon', 'Economical', '75000'], 
                   ['Subaru Forester', 'SUV', 'Adventure', '140000'], 
                   ['Honda Jazz', 'Hatchback', 'Compact', '70000'], 
                   ['Tesla Model 3', 'Coupe', 'Electric Vehicle', '120000'], 
                   ['Mercedes-Benz', 'Cabriolet', 'Turbo-charged', '250000']] 
        df = pd.DataFrame(carList, columns =['Model', 'Type', 'Spec', 'Price'])
        print(df)
        print('*'*100)
    
    #If user chooses 4 to Delete Car
    elif userinput == '4':
        print("\nYou have decided to delete a car")
        print(df)
        deleteOption=eval(input("Which car do you want to delete?: "))
        df.drop(deleteOption)

Output:
****************************************************************************************************
                                            PRACTICAL
                                            MAIN MENU
1. Display List of Cars
2. Add Car
3. Edit Car
4. Delete Car

Enter q to quit program
****************************************************************************************************

What would you like to do? 1

You have decided to display the list of cars.


             Model       Type              Spec   Price
0     Toyota Prius        MPV            Hybrid  140000
1       Honda City     Saloon        Economical   75000
2  Subaru Forester        SUV         Adventure  140000
3       Honda Jazz  Hatchback           Compact   70000
4    Tesla Model 3      Coupe  Electric Vehicle  120000
5    Mercedes-Benz  Cabriolet     Turbo-charged  250000
****************************************************************************************************

What would you like to do? 4

You have decided to delete a car
             Model       Type              Spec   Price
0     Toyota Prius        MPV            Hybrid  140000
1       Honda City     Saloon        Economical   75000
2  Subaru Forester        SUV         Adventure  140000
3       Honda Jazz  Hatchback           Compact   70000
4    Tesla Model 3      Coupe  Electric Vehicle  120000
5    Mercedes-Benz  Cabriolet     Turbo-charged  250000
Which car do you want to delete?: 1

Why doesn't the DataFrame with the deleted row get displayed at all in the menu loop although the functions are exactly the same? And how can I make it so that the DataFrame will always get updated when the user decides to display the list of cars at the end as well like my main problem?

I apologize for my lengthy thread and thank you for all the help. :)