class_docstr: A library of flowchart Node types. Custom libraries may be built to provide 
  each flowchart with a specific set of allowed Node types.
class_docstr_tok: ["A","library","of","flowchart","Node","types",".","Custom","libraries","may","be","built","to","provide","each","flowchart","with","a","specific","set","of","allowed","Node","types","."]
code: def __init__(self):
      self.nodeList = OrderedDict()
      self.nodeTree = OrderedDict()
  
file_path: pyqtgraph/pyqtgraph/flowchart/NodeLibrary.py
imports: from collections import OrderedDict
  from .Node import Node
label_desc: Use image node_id 1 to create a new NodeLibrary object  with example: obj = NodeLibrary()