class_docstr: Extends QTableWidget with some useful functions for automatic data handling
  and copy / export context menu. Can automatically format and display a variety
  of data types (see :func:`setData() <pyqtgraph.TableWidget.setData>` for more
  information.
docstr: Save all data to file.
docstr_tok: ["Save","all","data","to","file","."]
code: def saveAll(self):
      """Save all data to file."""
      self.save(self.serialize(useSelection=False))
  
imports: import numpy
  from ..Qt import QtCore, QtGui, QtWidgets
label_desc: Use image node_id 20 for calling the TableWidget obj's underlying member method code with example usage: obj.saveAll() without return types