Qt for Python (PySide/Shiboken)

this does though: from PySide2.QtCore import Qt, QSize from PySide2.QtWidgets import QTreeWidget, QTreeWidgetItem, QApplication app = QApplication([]) w = QTreeWidget() items = [QTreeWidgetItem([str(i)]) for i in range(10)] size = items[0].sizeHint(0) items[0].setData(0, Qt.SizeHintRole, QSize(size.width(), 50)) w.setUniformRowHeights(True) w.insertTopLevelItems(0, items) w.show() app.exec_()