Python if and loop

In Python looping and or/if

I've been using a Long process but limited codes.But codes must be in short process but Infinite

print("Press[A] to add a fruit")

print("Press[B] to edit a fruit list")

['apple', 'banana', 'mango', 'orange']

Enter your choice:A

Enter a fruit to be added: apple A fruit is already exist in record no.1

my codes has limitation like

if fruit in choice 1 print a fruit is already exist in record no.1

if fruit in slot choice 2 print a fruit is already exist in record no.2

...... What is the short process for Infinite code in determining in what record sequence exist in list.