code: def run(
      ctx,
      algofile,
      algotext,
      define,
      data_frequency,
      capital_base,
      bundle,
      bundle_timestamp,
      benchmark_file,
      benchmark_symbol,
      benchmark_sid,
      no_benchmark,
      start,
      end,
      output,
      trading_calendar,
      print_algo,
      metrics_set,
      local_namespace,
      blotter,
  ):
      """Run a backtest for the given algorithm."""
      # check that the start and end dates are passed correctly
      if start is None and end is None:
          # check both at the same time to avoid the case where a user
          # does not pass either of these and then passes the first only
          # to be told they need to pass the second argument also
          ctx.fail(
              "must specify dates with '-s' / '--start' and '-e' / '--end'",
          )
      if start is None:
          ctx.fail("must specify a start date with '-s' / '--start'")
      if end is None:
          ctx.fail("must specify an end date with '-e' / '--end'")
  
      if (algotext is not None) == (algofile is not None):
          ctx.fail(
              "must specify exactly one of '-f' / '--algofile' or"
              " '-t' / '--algotext'",
          )
  
      trading_calendar = get_calendar(trading_calendar)
  
      benchmark_spec = BenchmarkSpec.from_cli_params(
          no_benchmark=no_benchmark,
          benchmark_sid=benchmark_sid,
          benchmark_symbol=benchmark_symbol,
          benchmark_file=benchmark_file,
      )
  
      return _run(
          initialize=None,
          handle_data=None,
          before_trading_start=None,
          analyze=None,
          algofile=algofile,
          algotext=algotext,
          defines=define,
          data_frequency=data_frequency,
          capital_base=capital_base,
          bundle=bundle,
          bundle_timestamp=bundle_timestamp,
          start=start,
          end=end,
          output=output,
          trading_calendar=trading_calendar,
          print_algo=print_algo,
          metrics_set=metrics_set,
          local_namespace=local_namespace,
          environ=os.environ,
          blotter=blotter,
          benchmark_spec=benchmark_spec,
      )
  
imports: import errno
  import os
  import click
  import logbook
  import pandas
  from six import text_type
  import zipline
  from zipline.data import bundles
  from trading_calendars import get_calendar
  from zipline.utils.compat import wraps
  from zipline.utils.cli import Date, Timestamp
  from zipline.utils.run_algo import _run, BenchmarkSpec, load_extensions
  from zipline.extensions import create_args
label_desc: Use image node_id 4 for calling a global function with example usage: run(ctx, algofile, algotext, define, data_frequency, capital_base, bundle, bundle_timestamp, benchmark_file, benchmark_symbol, benchmark_sid, no_benchmark, start, end, output, trading_calendar, print_algo, metrics_set, local_namespace, blotter) and returns: _run