code: def is_tuple(node):
      """Does the node represent a tuple literal?"""
      if isinstance(node, Node) and node.children == [
          LParen(),
          RParen(),
      ]:
          return True
      return (
          isinstance(node, Node)
          and len(node.children) == 3
          and isinstance(node.children[0], Leaf)
          and isinstance(node.children[1], Node)
          and isinstance(node.children[2], Leaf)
          and node.children[0].value == "("
          and node.children[2].value == ")"
      )
  
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 18 for calling a global function with example usage: is_tuple(node) and returns: unknown, True