O'Reilly logo
  • Longxiang Lyu thinks this is interesting:

5-10. Checking Usernames:

From

Cover of Python Crash Course

Note

current_users = ['neyo', 'kanye', 'taylor', 'jayZ', 'beyonce']
new_users = ['kobe', 'yaoming', 'kaka', 'jayz', 'ronaldo']
for user in new_users:
taken = False
for registered in current_users:
if user.lower() == registered.lower():
taken = True
if taken:
print(user + " has been taken!")
else:
print(user + " not taken yet!")