code: def zipline_magic(line, cell=None):
      
      load_extensions(
          default=True,
          extensions=[],
          strict=True,
          environ=os.environ,
      )
      try:
          return run.main(
              # put our overrides at the start of the parameter list so that
              # users may pass values with higher precedence
              [
                  '--algotext', cell,
                  '--output', os.devnull,  # don't write the results by default
              ] + ([
                  # these options are set when running in line magic mode
                  # set a non None algo text to use the ipython user_ns
                  '--algotext', '',
                  '--local-namespace',
              ] if cell is None else []) + line.split(),
              '%s%%zipline' % ((cell or '') and '%'),
              # don't use system exit and propogate errors to the caller
              standalone_mode=False,
          )
      except SystemExit as e:
          # https://github.com/mitsuhiko/click/pull/533
          # even in standalone_mode=False `--help` really wants to kill us ;_;
          if e.code:
              raise ValueError('main returned non-zero status code: %d' % e.code)
docs: The zipline IPython cell magic.