Suppose, you  want  to  confirmed  the  user  from  one  list   to  another list  we  can  confirm  using  while  loop. we  will confirmed   the user  is  verified   or  not.

(1) unconfirmed_users =   ["alice","brian","cadace"]
confirmed_users =[]

# verify each user until # there are no more  #unconfirmed user 

# move each verified user into the list of confirmed users

(2)
while unconfirmed_users:
      current_users = unconfirmed_users.pop()
print("verify user:"+current_users)

 confirmed_users.append
 (current_users)

# Dislay the #confirmed_users 

(3) print("The following users have been confirmed : ")

(4)for confirmed_user in 
   confirmed_users:       
          print(confirmed_user)

Output:
verify user: cadace
verify user: brian
verify user: alice 

The following users have been  confirmed:
cadace 
brian 
alice 

Explanation:

     At (1) the list is unconfirmed_users list.
Then there are empty list of confirmed users.
We have to verify the user then transfer in confirmed_users. 
     
     At (2) the while loop is applied ,when the users are unconfirmed_users. 
Remove the item from unconfirmed_users, store in current_users variable. The last item will come first because it has pop. Then,this verified users display.

      At (3) the statement has display about the confirmed_users.
 
     At (4) for loop has  
used for display the  confirmed_user.

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