code: def listCanvases(self):
      return list(self.canvases.keys())
  
file_path: pyqtgraph/pyqtgraph/canvas/CanvasManager.py
imports: from ..Qt import QtCore, QtWidgets
  import weakref
label_desc: Use image node_id 5 for calling the CanvasManager obj's underlying member method code with example usage: obj.listCanvases() and returns: list