Using while loop to move items between two lists in Python

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It is very often that items in list should be moved to another list in Python programming. For example, users trying to register on a website can only be moved to a verified user list after certain conditions are met. In such circumstance, a while loop can be applied.

#a list of new users waiting to verify
new_users = ['Wilson', 'Mico', 'Shirley', 'Dudu', 'Miaomiao','dudu']
#en empty list for verified user
verified_users = []
#while loop to verify every new user
#if the lower form of the new user is same as one of the user in 
#verified user, then this user can not go into verified user list
while new_users:
    new_user = new_users.pop()
    
    if new_user.lower() not in verified_users:
        verified_users.append(new_user.lower())
    else:
        print(new_user + " is already in the list")
#output
Dudu is already in the list
# Display all verified users.
print("\nThese are all the verified users now:")
for verify_user in verified_users:
    print(verify_user)
#output
These are all the verified users now:
dudu
miaomiao
shirley
mico
wilson

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