def delete_file(self, path, prefixed_path, source_storage):
        """
        Checks if the target file should be deleted if it already exists
        """
        if self.storage.exists(prefixed_path):
            try:
                # When was the target file modified last time?
                target_last_modified = self.storage.get_modified_time(prefixed_path)
            except (OSError, __HOLE__, AttributeError):
                # The storage doesn't support get_modified_time() or failed
                pass
            else:
                try:
                    # When was the source file modified last time?
                    source_last_modified = source_storage.get_modified_time(path)
                except (OSError, NotImplementedError, AttributeError):
                    pass
                else:
                    # The full path of the target file
                    if self.local:
                        full_path = self.storage.path(prefixed_path)
                    else:
                        full_path = None
                    # Skip the file if the source file is younger
                    # Avoid sub-second precision (see #14665, #19540)
                    if (target_last_modified.replace(microsecond=0) >= source_last_modified.replace(microsecond=0) and
                            full_path and not (self.symlink ^ os.path.islink(full_path))):
                        if prefixed_path not in self.unmodified_files:
                            self.unmodified_files.append(prefixed_path)
                        self.log("Skipping '%s' (not modified)" % path)
                        return False
            # Then delete the existing file if really needed
            if self.dry_run:
                self.log("Pretending to delete '%s'" % path)
            else:
                self.log("Deleting '%s'" % path)
                self.storage.delete(prefixed_path)
        return True
dataset/ETHPy150Open django/django/django/contrib/staticfiles/management/commands/collectstatic.py/Command.delete_file