<p>如果当前_用户中存在“Maurya”,则不应接受“Maurya”作为可用用户名</p>
<pre><code>current_users = ["amit", "ajit", "nishant", "mohit", "Maurya"]
new_users = ["deepak", "manish", "maurya", "akhil", "ajit"]
for new_user in new_users:
if new_user in current_users:
print(f"{new_user}, you need to enter new username!")
else:
print(f"{new_user}, This username is available.")
</code></pre>
<pre><code>for new_user in new_users:
for current_user in current_users:
if new_user.lower() == current_user.lower():
print('new user {} allready present'.format(new_user))
</code></pre>