<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def has_better_coverage(self):
 """ Return `True` if coverage of has improved, `False` otherwise. This does not ensure that all changes have been covered. If this is what you want, use `CoberturaDiff.has_all_changes_covered()` instead. """

        for filename in self.files():
            if self.diff_total_misses(filename) > 0:
                return False
        return True