How do I check for the same words in two different lists?

Question

How can I check for the same words in two different lists if the words have different lower and uppercase letters? I wrote this:

current_users=["michael", "peta", "jennifer", "clark", "tony"]
new_users=["jeffry", "PETA", "shuff", "TOny", "guy"]

for new_user in new_users:

    if new_user.lower() in current_users:
        print("Sorry, the name "+new_user+" is already taken.")
    else:
        print("The name "+ new_user+ " is available.")

But it only works if the first list is in lowercase. Can this code be easily modified to disregard differences in case?

Answer 1

You can use list comprehensions .

Example

 if new_user.lower() in [user.lower() for user in current_users]:

Answer 2

if any(new_user.lower() == user.lower() for user in current_users)