code: def parse_exchange_list(path, exchange, default_compartment):
      
  
      context = FilePathContext(path)
  
      for exchange_def in exchange:
          if 'include' in exchange_def:
              include_context = context.resolve(exchange_def['include'])
              for exchange_compound in parse_exchange_file(
                      include_context, default_compartment):
                  yield exchange_compound
          else:
              for exchange_compound in parse_exchange(
                      exchange_def, default_compartment):
                  yield exchange_compound
docs: Parse a structured exchange list as obtained from a YAML file.
  
      Yields tuples of compound, reaction ID, lower and upper flux bounds. Path
      can be given as a string or a context.