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$ py -h
usage: py [-h] [-x] [-fx] [-l] [-c PRE_CMD] [-C POST_CMD] [-V] [--ji] 
          [--jo] [--si INPUT_DELIMITER] [--so OUTPUT_DELIMITER] [--i]
          [expression]

positional arguments:
  expression

optional arguments:
  -h, --help            show this help message and exit
  -x                    treat each row as x
  -fx                   keep rows satisfying condition(x)
  -l                    treat list of stdin as l
  -c PRE_CMD            run code before expression
  -C POST_CMD           run code after expression
  -V, --version         version info
  --ji, --json_input    pre-process each row with json.loads(row)
  --jo, --json_output   post-process each row with json.dumps(row)
  --si INPUT_DELIMITER, --split_input INPUT_DELIMITER
                        pre-process each row with re.split(delimiter, row)
  --so OUTPUT_DELIMITER, --split_output OUTPUT_DELIMITER
                        post-process each row with delimiter.join(row)
  --i, --ignore_exceptions
                        Wrap try-except-pass around each row of -x or -fx

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