code: def describe_token_expr(expr):
      """Like `describe_token` but for token expressions."""
      if ":" in expr:
          type, value = expr.split(":", 1)
          if type == TOKEN_NAME:
              return value
      else:
          type = expr
      return _describe_token_type(type)
  
imports: import re
  from ast import literal_eval
  from collections import deque
  from operator import itemgetter
  from ._compat import implements_iterator
  from ._compat import intern
  from ._compat import iteritems
  from ._compat import text_type
  from .exceptions import TemplateSyntaxError
  from .utils import LRUCache
label_desc: Use image node_id 3 for calling a global function with example usage: describe_token_expr(expr) and returns: _describe_token_type, value