Also, you should know that your password protects not just your own account, but the machine as a whole. Therefore, even though you might not care about having a good password (because your account doesn't contain anything you care about), we care. If your account is broken into by some nefarious hacker, the hacker can use it to attack other accounts and machines. Think of it like having a key to your dorm: if you leave the door unlocked, someone can get in to attack your friends and use your room as a base of operations.
We will be taking steps to protect the security of our computers, including testing passwords. If we find that your password is weak, we will ask you to change it to a better one. If you don't, we will have to lock your account. We do this not to be nasty, but because we have a responsibility to protect all the users on the machine. If your account is locked due to a bad password, you will receive an email (to your Wellesley mail account) telling you of the problem and directing you as to how to change your password. Until you resolve the problem, your account will be unusable. If this prevents you from finishing classwork, you'll have to talk to your professor about the consequences.