def expand(node: QTreeWidgetItem, level: int):
not_target = level != target_level
node.setExpanded(not_target)
if not_target:
for i in range(node.childCount()):
expand(node.child(i), level + 1)
def _expand_recursive(node: QTreeWidgetItem):
"""Expand node and its children."""
node.setExpanded(True)
for i in range(node.childCount()):
_expand_recursive(node.child(i))