class_docstr: Gather ids referenced by a node and not declared locally.
class_docstr_tok: ["Gather","ids","referenced","by","a","node","and","not","declared","locally","."]
code: def prepare(self, node):
      super(ImportedIds, self).prepare(node)
      if self.is_list:  # so that this pass can be called on list
          node = node.body[0]
      self.visible_globals = set(self.globals) - self.locals[node]
  
imports: from pythran.analyses.globals_analysis import Globals
  from pythran.analyses.locals_analysis import Locals
  from pythran.passmanager import NodeAnalysis
  import pythran.metadata
  import gast
label_desc: Use image node_id 13 for calling the ImportedIds obj's underlying member method code with example usage: obj.prepare(node) without return types