current_users = ['mohammad', 'shervin' , 'ali', 'oskol' , 'pro_gamer']
new_users = ['ali', 'ahmad', 'shervin', 'lara', 'helena']
current_users.lower()
new_users.lower()
for new_user in new_users:
if new_user in current_users:
print(new_user + " You must change your user name.")
else:
print("user name is available")
I need to know how to do case insensitive for this lists?
You need to apply the method to the individual strings in the list, not the list itself.
current_users = [user.lower() for user in current_users]
UPDATE
An alternate approach is to use sets which can figure out containment faster than your own loop:
current_users = ['mohammad', 'shervin' , 'ali', 'oskol' , 'pro_gamer']
new_users = ['ali', 'ahmad', 'shervin', 'lara', 'helena']
# normalize and convert to sets
current_users = set(user.lower() for user in current_users)
new_users = set(user.lower() for user in new_users)
# use sets to make decisions
conflicts = current_users & new_users
print("users {} already exist".format(', '.join(conflicts)))
uniques = new_users - current_users
print("users {} are available".format(', '.join(uniques)))
.lower()can only be applied to strings.
Try this:
current_users = ['mohammad', 'shervin', 'ali', 'oskol', 'pro_gamer']
new_users = ['ali', 'ahmad', 'shervin', 'lara', 'helena']
current_users = [user.lower() for user in current_users]
for new_user in new_users:
if new_user in current_users:
print(new_user + " You must change your user name.")
else :
print("user name is available")
.lower() can be applied to any class that has a lower method. list doesn't, but others do.