code: def lookup_submodule(self, name):
      # Look up a top-level module. Returns None if not found.
      return self.modules.get(name, None)
  
imports: from __future__ import absolute_import
  import os
  import re
  import sys
  import io
  from .None import Errors
  from .StringEncoding import EncodedString
  from .Scanning import PyrexScanner, FileSourceDescriptor
  from .Errors import PyrexError, CompileError, error, warning
  from .Symtab import ModuleScope
  from ..None import Utils
  from .None import Options
  from .None import Version
label_desc: Use image node_id 18 for calling the Context obj's underlying member method code with example usage: obj.lookup_submodule(name) and returns: self