code: def Comma():
      """A comma leaf"""
      return Leaf(token.COMMA, ",")
  
imports: from itertools import islice
  from .pgen2 import token
  from .pytree import Leaf, Node
  from .pygram import python_symbols
  from .None import patcomp
label_desc: Use image node_id 7 for calling a global function with example usage: Comma() and returns: Leaf