original_docstring: Activate a browser.
      Only needed when the test starts more than one browser instance.
docstring: Activate a browser.
  Only needed when the test starts more than one browser instance.
docstring_tokens: Activate a browser . Only needed when the test starts more than one browser instance .
code: def activate_browser(browser_id):
      """Activate a browser.
      Only needed when the test starts more than one browser instance."""
      if not browser_id in execution.browsers:
          # TODO, use error() function
          raise Exception("Error: {} is not a valid browser id. Current browsers "
                          "are: {}".format(browser_id, ', '.join(execution.browsers.keys())))
      else:
          execution.browser = execution.browsers[browser_id]
code_tokens: def activate_browser ( browser_id ) : if not browser_id in execution . browsers : raise Exception ( "Error: {} is not a valid browser id. Current browsers " "are: {}" . format ( browser_id , ', ' . join ( execution . browsers . keys ( ) ) ) ) else : execution . browser = execution . browsers [ browser_id ]
short_docstring: Activate a browser.
short_docstring_tokens: Activate a browser .
comment: """Activate a browser.
      Only needed when the test starts more than one browser instance."""$SEP$# TODO, use error() function