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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def user_save(self):
 """Save the current user :returns: None :rtype: None :raises: None """

        if not self.cur_user:
            return

        username = self.user_username_le.text()
        first = self.user_first_le.text()
        last = self.user_last_le.text()
        email = self.user_email_le.text()
        self.cur_user.username = username
        self.cur_user.first_name = first
        self.cur_user.last_name = last
        self.cur_user.email = email
        self.cur_user.save()