Why this code is wrong??

Question

I'm wrong in part two and three of this code, but I can't understand.

def add():
a = input('Enter your car name: ')
car_name.append(a)

def remove(car_name):
if car_name in car_name:
car_name.remove(car_name)
else:
print('You do not have this car!!!')

def show():
for car in car_name:
print('Car name = ', car)

select = None

car_name = []
while select != 4:
select = int(input('''1 : show cars list
2 : join cars
3 : remove cars
4 : exit
What do you want?
''' ))

if select == 1:
show()
elif select == 2:
add()
print('added')
elif select == 3:
car_name = input('enter your car name: ')
remove(car_name)

Answer 1

def add():
a = input('Enter your car name: ')
car_name.append(a)

def remove_car(a):
if a in car_name:
car_name.remove(a)
else:
print('You do not have this car!!!')

def show():
for car in car_name:
print('Car name = ', car)

select = None

car_name = []
while select != 4:
select = int(input('''1 : show cars list
2 : join cars
3 : remove cars
4 : exit
What do you want?
''' ))

if select == 1:
show()
elif select == 2:
add()
print('added')
elif select == 3:
a = input('enter your car name: ')
remove_car(a)

Answer 2

don't use same variable names.(in remove function)
Also renamed remove to remove_car so as not to introduce confusion with list.remove method.